Question

if sin theta + sin²theta = 1, then prove that cos²theta + cos⁴theta = 1​

Answer 1

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Answer 2

Answer:

sin theta +sin^2 thetha=1

hence sin theta = 1- sin^2thetha = cos^2 thetha

put the value in equation

cos^2thetha + cos^4 thetha

= sin thetha + sin^2 thetha

which is given =1

hence proved