`cos 3x`

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

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

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

cos 3 x cos 2 x

(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)

Prove that: cos3x=4cos^(3)x-3cosx

Prove : cos3x=4cos^(3)x-3cosx