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pp Grade: 12th pass
        
sinx+sin2x=1,then cos2x+xos4x=?
2 years ago

Answers : (1)

Vijay Mukati
askIITians Faculty
2591 Points
										Ans. 4*sinx*sin2x (Hint. Replace cos2x by 1-2sin2x, similarly to cos4x. Then simplify and use identity a2 + b2 = (a+b)2 – 2ab).
										
2 years ago
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