Question

(cos 5A/cos A) + (sin 5A/sin A)= a+b cos 4A, then the value of a+b is

Answer 1

Step-by-step explanation:

(2sin 6A)/(2 cosAsinA )=(a+b)cos 4A

a+b=(2sin6A/sin2Acos4A)

further simplication can be done..

formula:sin(a+b)=sinacosb+cosasinb

sin2a=2sinacosa