1.

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

Answer»

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



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