`cos3x`

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cos 3x

Prove that cos ^(3) (x-(2pi)/(3)) + cos ^(3) x + cos ^(3) (x + (2pi)/(3)) = (3)/(4) cos 3x.

Show that cos 3 x=4 cos ^(3)x-3 cos x

Prove that cos 3x=4 cos ^3x-3cos x

(cos x)/(cos 3x)

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

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

Solve : cos 3x. Cos^(3)x+sin 3x.sin^(3)x=0