Cos(a-
yiae cuatorny va
cosacosb tina inb Cu)
Cas aCos b - in abinb 2)
snla) - SinaCabt cosoAinb C3)
COsail (4)
tan (ar) - tan a t ranb (5)
A- tanaraunb
kan lo-b)
tan Q- toob
1 t fanatahh
Thú
ngày
*) Nhaw o, nha
Sin 2az 2ing coa
2coN
22rana
- (ox
Nin'y
sinkx
Sin 4ic
)
sina
Gina Cos b
20
HONGHA
(o,a ninb 1
Sin lat) - Stn
arh
Sinat Anb
Snc Sinb
(ob)( )
2ces
atb
2
(os o-cosb -2sars \sn
tn at tanh
Sin (ath)
tun a-
Sin
anb
2
-