Question

if sin theta + sin squared theta is equal to 1 prove that cos square theta + cos 4 theta is equal to 1

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

Sin theta+sin sq.theta=1

Sin theta=1- sin sq.theta

Sin theta=cos sq. theta

1 equation

Cos sq. theta+cos^4 theta=1

LHS,

Cos sq.theta+cos power 4

Sin theta+sin sq.theta(from 1 equation)

1 ans.