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Here sinc + sin²c = 1
Sinc = 1 - sin²c = cos²c
Sinc = cos²c
Now, cos²c + cos⁴c = cos²c + (cos²c)²
= sinc + sin²c
Cos²c + cos⁴c= 1
Hence proved.
Sinc = 1 - sin²c = cos²c
Sinc = cos²c
Now, cos²c + cos⁴c = cos²c + (cos²c)²
= sinc + sin²c
Cos²c + cos⁴c= 1
Hence proved.
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