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sinx+sin2x=1,then cos2x+xos4x=?

sinx+sin2x=1,then cos2x+xos4x=?

Grade:12th pass

1 Answers

Vijay Mukati
askIITians Faculty 2590 Points
8 years ago
Ans. 4*sinx*sin2x (Hint. Replace cos2x by 1-2sin2x, similarly to cos4x. Then simplify and use identity a2 + b2 = (a+b)2 – 2ab).

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