Trigonometric EquationHard

Question

If sin x + sin2 x = 1 then the value of cos2x + cos4x is - 

Options

A.0
B.2
C.1
D.None of these

Solution

sin x = 1 - sin2 x = cos2 x
than cos2 x + cos4 x = sin x + sin2 x = 1

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