Question

Prove it If you will prove this question so, you are the genius.​

Answer 1

Answer:

sina-msinb or, m=sina/sinb

tana=ntanb---------(1) and

or, sina/cosa=n(sinb/cosb)

or. n=sinacosb/cosasinb or, n=m (cosb/cosa)----(2)

or, ncosa=mcosb or, n°cos a°cos?b

or. n cosa=m²(1-sinb) [*: , sin’a+cosa=1]

or, n cos'a=m'(1-sin'a/m)

(using (1))

or, n°cos a=m'({m²-sin*a)/m)

or, n-cos?a=m2-sin’a

or, cos a-m2 (1-cos or, n°cos'a=m2-1+cos²an

a)or, n cos a cos?a=m2-1 or, cos a(n?-1)=m²-11

or, cos?a=(m²-1)/(n2-1)