`cos 3x`

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` int cos 3x dx= (1)/(3) sin 3x+c`

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Prove that sin 3x . sin^(3) x+cos 3 x . Cos^(3)x=cos^(3) 2x

If the equation cos 3 x cos^(3) x + sin 3 x sin^(3) x =0 , then x is equal to

sqrt(cos3x)

sin^(-1)(cos3x)

Find the minimal period of f(x)=cos x+cos3x

(cos3x-cos x)/(cos x+cos3x)

y=cos^(-1)sqrt((cos3x)/(cos^(3)x)), thenshowthat (dy)/(dx)=sqrt((3)/(cos x cos3x))

Find the maximum value of cos^(3)x+cos^(3)(120-x)+cos^(3)(120+x)

If intsqrt((cos x-cos^(3)x)/(1-cos^(3)x))dx=f(x)+c , then f(x)=

(sin^(3)x+cos^(3)x)/(sin x+cos x)+(sin^(3)x-cos^(3)x)/(sin x-cos x)=2