Analysis & Approaches - 1 Page Formula Sheet
IB Mathematics SL & HL – First examinations 2021
Topic 3: Geometry and trigonometry – SL & HL
Prior Learning SL & HL
Area: Parallelogram
Area: Triangle
Area: Trapezoid
Area: Circle
Circumference: Circle
Volume: Cuboid
Volume: Cylinder
Volume: Prism
Area: Cylinder curve
𝐴 = 𝑏ℎ , 𝑏 = base, ℎ = height
1
𝐴 = 2 (𝑏ℎ) , 𝑏 = base, ℎ = height
1
𝐴 = 2 (𝑎 + 𝑏)ℎ , 𝑎, 𝑏 = parallel sides, ℎ = height
𝐴 = 𝜋𝑟 2 , 𝑟 = radius
𝐶 = 2𝜋𝑟, 𝑟 = radius
𝑉 = 𝑙𝑤ℎ , 𝑙 = length, 𝑤 = width, ℎ = height
Distance between 2 points distance (𝑑) =
(𝒙𝟏 , 𝒚𝟏 , 𝒛𝟏 ) , (𝒙𝟐 , 𝒚𝟐 , 𝒛𝟐 )
Coordinates of the
midpoint with endpoints
(𝒙𝟏 , 𝒚𝟏 , 𝒛𝟏 ) , (𝒙𝟐 , 𝒚𝟐 , 𝒛𝟐 )
Volume: Right cone
𝑉 = 𝜋𝑟 ℎ , 𝑟 = radius, ℎ = height
𝐴 = 2𝜋𝑟ℎ , 𝑟 = radius, ℎ = height
Surface area: Sphere
𝑉 = 𝐴ℎ , 𝐴 = cross-section area, ℎ = height
Volume: Sphere
Distance between two
𝑑 = √(𝑥1 − 𝑥2 )2 + (𝑦1 − 𝑦2 )2
points (𝒙𝟏 , 𝒚𝟏 ) , (𝒙𝟐 , 𝒚𝟐 )
Sine rule
Topic 1: Number and algebra - SL & HL
Area: Triangle
The 𝒏th term of an
arithmetic sequence
Length of an arc
Coordinates of midpoint
Sum of 𝒏 terms of an
arithmetic sequence
The 𝒏th term of a
geometric sequence
Sum of 𝒏 terms of a
finite geometric seq.
Compound interest
(
𝑥1 +𝑥2 𝑦1 +𝑦2
2
,
2
), for endpoints (𝑥1 , 𝑦1), (𝑥2 , 𝑦2 )
𝑢𝑛 = 𝑢1 + (𝑛 − 1)𝑑
𝑛
𝑛
𝑠𝑛 = (2𝑢1 + (𝑛 − 1)𝑑) = (𝑢1 + 𝑢𝑛 )
2
2
𝑢𝑛 = 𝑢1 𝑟 𝑛−1
𝑢1 (𝑟 𝑛 − 1) 𝑢1 (1 − 𝑟 𝑛 )
=
,𝑟 ≠ 1
𝑟−1
1−𝑟
𝑘
𝑛
𝑟
𝐹𝑉 = 𝑃𝑉 × (1 +
)
100𝑘
𝑠𝑛 =
𝐹𝑉 is future value, 𝑃𝑉 is present value, 𝑛 is
the number of years, 𝑘 is the number of
compounding periods per year, 𝑟% is the
nominal annual rate of interest
Binomial theorem
Binomial coefficient
(𝑎 + 𝑏)𝑛 =
𝑎𝑛 + (𝑛1)𝑎𝑛−1 𝑏+. . . +(𝑛𝑟)𝑎𝑛−𝑟 𝑏𝑟 +. . . + 𝑏𝑛
𝑛!
𝑛
( ) = nC r =
𝑟
𝑟!(𝑛−𝑟)!
Topic 1: Number and algebra - HL only
Combinations
Permutations
Complex numbers
Modulus-argument (polar)
& Exponential (Euler) form
De Moivre’s theorem
nC =
r
nPr =
𝑛!
𝑟!(𝑛−𝑟)!
𝑛!
(𝑛−𝑟)!
𝑧 = 𝑎 + 𝑏𝑖
Pythagorean identity
Double angle identities
Reciprocal trigonometric
identities
Pythagorean identities
Equations of a
straight line
Gradient formula
Axis of symmetry of a
quadratic function
Solutions of a
quadratic equation in
the form 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄
Discriminant
Exponential and
logarithmic functions
Scalar product
Angle between two
vectors
Vector equ. of a line
Parametric form of the
equation of a line
Cartesian equations of
a line
Vector product
𝑟 𝑛 (cos 𝑛𝜃 + 𝑖 sin 𝑛𝜃) = 𝑟 𝑛 𝑒 𝑖𝑛𝜃 = 𝑟 𝑛 cis𝑛𝜃
Equation of a plane
𝑦 = 𝑚𝑥 + 𝑐 ; 𝑎𝑥 + 𝑏𝑦 + 𝑑 = 0 ;
𝑦 − 𝑦1 = 𝑚(𝑥 − 𝑥1 )
𝑦2 − 𝑦1
𝑚=
𝑥2 − 𝑥1
𝑏
𝑓(𝑥) = 𝑎𝑥 2 + 𝑏𝑥 + 𝑐 → 𝑥 = −
2𝑎
−𝑏 ± √𝑏2 − 4𝑎𝑐
𝑥=
,𝑎 ≠ 0
2𝑎
∆ = 𝑏2 − 4𝑎𝑐
𝑎 𝑥 = 𝑒 𝑥 ln 𝑎 ; log 𝑎 𝑎 𝑥 = 𝑥 = 𝑎 log𝑎 𝑥
where 𝑎, 𝑥 > 0 , 𝑎 ≠ 1
Topic 2: Functions – HL only
Sum & product of the
roots of polynomial
equations of the form
Magnitude of a vector
Area of a
parallelogram
Topic 2: Functions – SL & HL
𝑛
∑ 𝑎𝑟 𝑥 𝑟 = 0
𝑟=0
⇒ Sum is
(−1)𝑛 𝑎0
−𝑎𝑛−1
; product is
𝑎𝑛
𝑎𝑛
=
sin𝐵
𝑉 = 3 𝜋𝑟 , 𝑟 = radius
𝐴 = 4𝜋𝑟 2 , 𝑟 = radius
𝑎
sin𝐴
𝑏
=
1
𝐴 = 2 𝑟 2 𝜃 , 𝑟 = radius, 𝜃 = angle in radians
sin 𝜃
cos 2 𝜃 + sin2 𝜃 = 1
Vector equ. of a plane
Cartesian equ. of a plane
1
;
cos 𝜃
sec 𝜃 =
2
2
cosec 𝜃 =
2
1
sin 𝜃
2 tan 𝜃
1 − tan2 𝜃
|𝒗| = √𝑣1 2 + 𝑣2 2 + 𝑣3 2
𝒗 ∙ 𝒘 = 𝑣1 𝑤1 + 𝑣2 𝑤2 + 𝑣3 𝑤3
𝒗 ∙ 𝒘 = |𝒗||𝒘| cos 𝜃
where 𝜃 is the angle between 𝒗 and 𝒘
𝑣1 𝑤1 + 𝑣2 𝑤2 + 𝑣3 𝑤3
cos 𝜃 =
|𝒗||𝒘|
𝒓 = 𝒂 + 𝜆𝒃
𝑥 = 𝑥0 + 𝜆𝑙, 𝑦 = 𝑦0 + 𝜆𝑚, 𝑧 = 𝑧0 + 𝜆𝑛
Variance of a discrete
random variable X
Variance of a continuous
random variable X
𝐴 = |𝒗 × 𝒘| , where 𝒗 and 𝒘 form two
adjacent sides of a parallelogram
𝒓 = 𝒂 + 𝜆𝒃 + 𝜇𝒄
Derivative of 𝒙𝒏
𝒏
Derivative of 𝒆𝒙
Derivative of 𝐥𝐧 𝒙
Chain rule
Product rule
Quotient rule
Acceleration
Distance; Displacement
travelled from 𝒕𝟏 to 𝒕𝟐
Standard integrals
̅ , of a set of
Mean, 𝒙
data
Probability of an event A
𝑥̅ =
P(𝐴) =
𝑛
𝑛(𝐴)
𝑛(𝑢)
, where 𝑛 = ∑𝑘
𝑖=1 𝑓𝑖
Mutually exclusive
events
Conditional probability
Independent events
Expected value: Discrete
random variable X
P(𝐴|𝐵) =
P(𝐴 ∩ 𝐵)
P(𝐵)
P(𝐴 ∩ 𝐵) = P(𝐴)P(𝐵)
E(𝑋) = ∑ 𝑥 P(𝑋 = 𝑥)
𝑋~B(𝑛, 𝑝)
E(𝑋) = 𝑛𝑝 ; Var(𝑋) = 𝑛𝑝(1 − 𝑝)
𝑥−𝜇
Standardized normal variable
𝑧=
𝜎
Binomial distribution
Mean ; Variance
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∞
Var(𝑋) = ∫−∞(𝑥 − 𝜇)2 𝑓(𝑥)d𝑥
∞
= ∫−∞ 𝑥 2 𝑓(𝑥)d𝑥 − 𝜇2
𝑓(𝑥) = 𝑥 𝑛 → 𝑓′(𝑥) = 𝑛𝑥 𝑛−1
𝑥 𝑛+1
∫ 𝑥 𝑛 𝑑𝑥 =
+ 𝐶 , 𝑛 ≠ −1
𝑛+1
𝑏
𝐴 = ∫ 𝑦 𝑑𝑥 ,
where 𝑓(𝑥) > 0
𝑎
𝑓(𝑥) = sin 𝑥 → 𝑓′(𝑥) = cos 𝑥
𝑓(𝑥) = cos 𝑥 → 𝑓′(𝑥) = − sin 𝑥
𝑓(𝑥) = 𝑒 𝑥 → 𝑓′(𝑥) = 𝑒 𝑥
1
𝑓(𝑥) = ln 𝑥 → 𝑓′(𝑥) =
𝑥
𝑑𝑦
𝑑𝑦 𝑑𝑢
𝑦 = 𝑔(𝑢) , 𝑢 = 𝑓(𝑥) →
=
×
𝑑𝑥
𝑑𝑢 𝑑𝑥
𝑑𝑦
𝑑𝑣
𝑑𝑢
𝑦 = 𝑢𝑣 →
=𝑢
+𝑣
𝑑𝑥
𝑑𝑥
𝑑𝑥
𝑑𝑢
𝑑𝑣
𝑣
−
𝑢 𝑑𝑥
𝑢
𝑑𝑦
𝑑𝑥
𝑦=
→
=
𝑣2
𝑣
𝑑𝑥
d𝑣 d2 𝑠
𝑎=
=
d𝑡 d𝑡 2
𝑡2
𝑡2
dist = ∫ |𝑣(𝑡)| 𝑑𝑡 ;
disp = ∫ 𝑣(𝑡) 𝑑𝑡
𝑡1
𝑡1
1
∫ 𝑑𝑥 = ln|𝑥| + 𝐶
𝑥
∫ sin 𝑥 𝑑𝑥 = − cos 𝑥 + 𝐶
∫ 𝑒 𝑥 𝑑𝑥 = 𝑒 𝑥 + 𝐶
𝑏
Derivative of 𝒇(𝒙)
from first principles
𝑓(𝑥 + ℎ) − 𝑓(𝑥)
d𝑦
= 𝑓′(𝑥) = lim (
)
ℎ→0
ℎ
d𝑥
Standard
derivatives
P(𝐴 ∪ 𝐵) = P(𝐴) + P(𝐵) − P(𝐴 ∩ 𝐵)
P(𝐴 ∪ 𝐵) = P(𝐴) + P(𝐵)
Var(𝑋) = ∑(𝑥 − 𝜇)2 P(𝑋 = 𝑥)
= ∑ 𝑥 2 P(𝑋 = 𝑥) − 𝜇2
𝑎
Topic 5: Calculus – HL only
Complementary events P(𝐴) + P(𝐴′ ) = 1
Combined events
∞
E(𝑋) = 𝜇 = ∫−∞ 𝑥𝑓(𝑥)d𝑥
𝐴 = ∫ |𝑦| 𝑑𝑥
𝑎𝑥 + 𝑏𝑦 + 𝑐𝑧 = 𝑑
∑𝑘
𝑖=1 𝑓𝑖 𝑥𝑖
𝑛
Area enclosed by a
curve and 𝒙-axis
𝒓 ∙ 𝒏 = 𝒂 ∙ 𝒏 (using the normal vector)
IQR = 𝑄3 − 𝑄1
− 𝜇2
𝑛
∫ cos 𝑥 𝑑𝑥 = sin 𝑥 + 𝐶
Topic 4: Statistics and probability - SL & HL
Interquartile range
∑𝑘 𝑓 (𝑥𝑖 −𝜇)2
𝜎 = √ 𝑖=1 𝑖
=
Topic 5: Calculus - SL & HL
𝑥 − 𝑥0 𝑦 − 𝑦0 𝑧 − 𝑧0
=
=
𝑙
𝑚
𝑛
𝑣2 𝑤3 − 𝑣3 𝑤2
𝒗 × 𝒘 = (𝑣3 𝑤1 − 𝑣1 𝑤3 )
𝑣1 𝑤2 − 𝑣2 𝑤1
|𝒗 × 𝒘| = |𝒗||𝒘| sin 𝜃
where 𝜃 is the angle between 𝒗 and 𝒘
𝑛
Var(𝑋) = E(𝑋 − 𝜇)2 = E(𝑋 2 ) − [E(𝑋)]2
Variance
Derivative of 𝐜𝐨𝐬 𝒙
sin(𝐴 ± 𝐵) = sin 𝐴 cos 𝐵 ± cos 𝐴 sin 𝐵
cos(𝐴 ± 𝐵) = cos 𝐴 cos 𝐵 ∓ sin 𝐴 sin 𝐵
tan 𝐴 ± tan 𝐵
tan(𝐴 ± 𝐵) =
1 ∓ tan 𝐴 tan 𝐵
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E(𝑎𝑋 + 𝑏) = 𝑎E(𝑋) + 𝑏
Var(𝑎𝑋 + 𝑏) = 𝑎2 Var(𝑋)
Derivative of 𝐬𝐢𝐧 𝒙
1 + tan 𝜃 = sec 𝜃 ; 1 + cot 𝜃 = cosec 𝜃
tan 2𝜃 =
Linear transformation of
a single random variable
Area enclosed by a
curve and the 𝒙-axis
2
2
∑𝑘
𝑖=1 𝑓𝑖 𝑥𝑖
𝜎2 =
Integral of 𝒙
sin 2𝜃 = 2 sin 𝜃 cos 𝜃
cos 2𝜃 = cos 2 𝜃 − sin2 𝜃
= 2 cos 2 𝜃 − 1
= 1 − 2 sin2 𝜃
2
∑𝑘
𝑖=1 𝑓𝑖 (𝑥𝑖 −𝜇)
Variance 𝝈𝟐
Expected value: Continuous
random variable X
𝑐
sin𝐶
Topic 3: Geometry and trigonometry – HL only
𝑧 = 𝑟(cos 𝜃 + 𝑖 sin 𝜃) = 𝑟𝑒 𝑖𝜃 = 𝑟cis𝜃
[𝑟(cos 𝜃 + 𝑖 sin 𝜃)]𝑛 =
3
P(𝐵𝑖 |𝐴) =
P(𝐵)P(𝐴|𝐵)
P(𝐵)P(𝐴|𝐵) + P(𝐵′ )P(𝐴|𝐵′ )
P(𝐵𝑖 )P(𝐴|𝐵𝑖 )
P(𝐵1 )P(𝐴|𝐵1 ) + P(𝐵2 )P(𝐴|𝐵2 ) + P(𝐵3 )P(𝐴|𝐵3 )
Standard Deviation 𝝈
𝐴 = 𝜋𝑟𝑙 , 𝑟= radius, 𝑙 = slant height
tan 𝜃 = cos 𝜃
Exponents & logarithms
𝑢1
, |𝑟| < 1
1−𝑟
𝑉 = 3 𝜋𝑟 2 ℎ , 𝑟= radius, ℎ = height
Identity for 𝐭𝐚𝐧 𝜽
Double angle identity
for tan
𝑠∞ =
1
Area of a sector
Compound angle
identities
The sum of an infinite
geometric sequence
1
4
P(𝐵|𝐴) =
Bayes’ theorem
𝑥1 + 𝑥2 𝑦1 + 𝑦2 𝑧1 + 𝑧2
,
,
)
2
2
2
𝑐 2 = 𝑎2 + 𝑏2 − 2𝑎𝑏 cos 𝐶
𝑎2 + 𝑏2 − 𝑐 2
cos 𝐶 =
2𝑎𝑏
1
𝐴 = 𝑎𝑏 sin 𝐶
2
𝑙 = 𝑟𝜃 , 𝑟 = radius, 𝜃 = angle in radians
Cosine rule
Exponents & logarithms 𝑎 𝑥 = 𝑏 ↔ 𝑥 = log 𝑎 𝑏 , 𝑎, 𝑏 > 0, 𝑎 ≠ 1
log 𝑎 𝑥𝑦 = log 𝑎 𝑥 + log 𝑎 𝑦
𝑥
log 𝑎 = log 𝑎 𝑥 − log 𝑎 𝑦
𝑦
log 𝑎 𝑥 𝑚 = 𝑚 log 𝑎 𝑥
log𝑏 𝑥
log 𝑎 𝑥 =
log 𝑏 𝑎
(
Volume: Right-pyramid 𝑉 = 3 𝐴ℎ , 𝐴 = base area, ℎ = height
Area: Cone curve
2
√(𝑥1 − 𝑥2 )2 + (𝑦1 − 𝑦2 )2 + (𝑧1 − 𝑧2 )2
Topic 4: Statistics and probability – HL only
Standard
integrals
𝑓(𝑥) = tan 𝑥 ⇒ 𝑓 ′ (𝑥) = sec 2 𝑥
𝑓(𝑥) = sec 𝑥 ⇒ 𝑓 ′ (𝑥) = sec 𝑥 tan 𝑥
𝑓(𝑥) = cosec 𝑥 ⇒ 𝑓 ′ (𝑥) = −cosec 𝑥 cot 𝑥
𝑓(𝑥) = cot 𝑥 ⇒ 𝑓 ′ (𝑥) = −cosec 2 𝑥
𝑓(𝑥) = 𝑎 𝑥 ⇒ 𝑓 ′ (𝑥) = 𝑎 𝑥 (ln 𝑎)
1
𝑓(𝑥) = log𝑎 𝑥 ⇒ 𝑓 ′ (𝑥) =
𝑥 ln 𝑎
1
𝑓(𝑥) = arcsin 𝑥 ⇒ 𝑓 ′ (𝑥) =
√1 − 𝑥 2
1
𝑓(𝑥) = arccos 𝑥 ⇒ 𝑓 ′ (𝑥) = −
√1 − 𝑥 2
1
𝑓(𝑥) = arctan 𝑥 ⇒ 𝑓 ′ (𝑥) =
1 + 𝑥2
1
∫ 𝑎 𝑥 d𝑥 = ln 𝑎 𝑎 𝑥 + 𝐶
1
1
𝑥
∫ 𝑎2 +𝑥2 d𝑥 = 𝑎 arctan (𝑎) + 𝐶
1
𝑥
Integration by parts
∫ √𝑎2 −𝑥2 d𝑥 = arcsin (𝑎) + 𝐶 , |𝑥| < 𝑎
Area enclosed by a
curve and 𝒚-axis
𝐴 = ∫𝑎 |𝑥| 𝑑𝑦
Volume of revolution
about 𝒙 or 𝒚-axes
d𝑣
d𝑢
∫ 𝑢 d𝑥 𝑑𝑥 = 𝑢𝑣 − ∫ 𝑣 d𝑥 𝑑𝑥
𝑏
𝑏
𝑏
Euler’s method
𝑉 = ∫𝑎 𝜋𝑦 2 𝑑𝑥 or 𝑉 = ∫𝑎 𝜋𝑥 2 𝑑𝑦
Integrating factor for
𝒚′ + 𝑷(𝒙)𝒚 = 𝑸(𝒙)
Maclaurin series
𝑒 ∫ 𝑃(𝑥)d𝑥
Maclaurin series for
special functions
∙ 𝑒 𝑥 = 1 + 𝑥 + 𝑥2! + ... ∙ ln(1 + 𝑥) = 𝑥 − 𝑥2 + 𝑥3 − ...
𝑦𝑛+1 = 𝑦𝑛 + ℎ × 𝑓(𝑥𝑛 , 𝑦𝑛 ); 𝑥𝑛+1 = 𝑥𝑛 + ℎ
where ℎ is a constant (step length)
𝑓(𝑥) = 𝑓(0) + 𝑥𝑓 ′ (0) +
2
𝑥3
𝑥5
𝑥 2 ′′
𝑓 (0)+ . ..
2!
2
3
𝑥2
𝑥4
∙ sin 𝑥 = 𝑥 − 3! + 5! − ... ∙ cos 𝑥 = 1 − 2! + 4! − ...
3
5
∙ arctan 𝑥 = 𝑥 − 𝑥3 + 𝑥5 − ...