Prove that 3sin^-1(x) = sin^-1(3x - 4(x^3)), x€[-1/2,1/2].

Prove that 1. 3sin^-1x=sin^-1(3x-4x^3) 2. 3cos^-1x=cos^-1(4x^3-3x) || exercise2.2 12th Q1 and Q2

Prove that 3cos^-1(x) = cos^-1(4(x^3) - 3x), x€[1/2,1] .