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Prove that \( \cos^{-1}(4x^3-3x)=3\cos^{-1}x.\)

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\[Take\:x=CosA\:then\:Cos^{-1}x=A\]

\[L.H.S.\:becomes.Cos^{-1}Cos3A=3A=3Cos^{-1}x\]
answered Feb 15, 2013 by rvidyagovindarajan_1
 

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