Question

cos^4 theta - sin^4 theta = 1/2 then the value of theta = ?​

Answer 1

Answer:

Step-by-step explanation:

(Cos^2A) ^2- (sin^2A) ^2= 1/2

Cos^4A - (1-cos^2A) ^2 = 1/2

Cos^4A - 1 - cos^4A + 2cos^2A =1/2

2cos^2A = 1/2+1

CosA = √3/2

A = 30 degree