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Grade: 10

                        

if sinx + sin 2 x+ sin 3 x = 1 , then prove that cos 6 x- 4cos 4 x + 8cos 2 x= 4 .This is the hardest question and I ...

4 years ago

Answers : (1)

kanha kasniya
12 Points
							Sin(x) +sin^3(x) = 1-sin^2(x) => sin^2(x)[1+sin^2(x)]^2=cos^4(x)=> [1-cos^2(x)][2-cos^2(x)]^2=cos^4(x)Cos^6(x) - 4cos^4(x) + 8cos^2(x) = 4
						
4 years ago
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