if cos theta + cos2 theta = 1

than prove thhat

sin2 theta + sin4 theta= 1

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 Lets say cosA + Cos^2A=1 as equation no 1

 
There fore cosA + Cos^2A = Sin^2A+Cos^2A. [as 1=Cos2A+Sin2A]
That implies. CosA=Sin^2A
Replacing cosA=Sin^A in equation 1 we will get Sin^2A+sin^4A=1

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