Question

cos⁴x-sin⁴x=½thenx=​

Answer 1

full solution of this question

Answer 2

(cos^2x)^2- (sin^2x)^2

(cos^2+sin^2) (cos^2-sin^2)=1/2

we know that cos^2+sin^2=1

cos^2-sin^2=1/2

put value x=30

3/4-1/4=1/2

verified

answer x=30