Question

Cos^6a+sin^6a+ksin^2a=1 then k equal to

Answer 1

Answer:

cos6α+sin6α+ksin22α=1

⇒(cos2α)3+(sin2α)3+ksin22α=1

⇒1−3sin2αcos2α+ksin22α=1

⇒1−43sin22α+ksin22α=1

⇒1+sin22α(k−43)=1

⇒k=43

Answer 2

Answer:

k=3Cos^2a

answer is explained in the pic