if sin theta=1/2 show that 3costheta-4cos³theta=0
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sinx=1/2 , where X is theta
cosx=√1-sinx×sinx
cosx=√1-1/4
cosx=√3/2
3cosx-4cosx×cosx×cosx
3×√3/2-4×√3/2×√3/2×√3/2
3√3/2-12√3/8
3√3/2-3√3/2=0=RHS
cosx=√1-sinx×sinx
cosx=√1-1/4
cosx=√3/2
3cosx-4cosx×cosx×cosx
3×√3/2-4×√3/2×√3/2×√3/2
3√3/2-12√3/8
3√3/2-3√3/2=0=RHS
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