if sin phi + sin²phi =1, then cos²phi +cos⁴phi is
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Answered by
0
Answer:
1
Step-by-step explanation:
As,
sin phi + sin²phi =1
sin phi = 1 - sin²phi
= cos²phi
Then,
cos²phi + cos⁴phi = cos²phi + (cos²phi)^2
= sin phi + (sin phi)^2
= sin phi + sin²phi
= 1 (Ans)
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