evalute above
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solution :
3sin^-1(x) = sin^-1(3x - 4x^3)
when -1/2<=x<=1/2
3sin^-1(0.4) = sin^-1[3*0.4 - 4*0.4^3]
3sin^-1(0.4) = sin^-1[1.2 - 4*0.064]
3sin^-1(0.4) = sin^-1[1.2 - 0.256]
3sin^-1(0.4) = sin^-1[0.944]
sin(3sin^-1(0.4)) = sin{sin^-1(0.944)} = 0.944
3sin^-1(x) = sin^-1(3x - 4x^3)
when -1/2<=x<=1/2
3sin^-1(0.4) = sin^-1[3*0.4 - 4*0.4^3]
3sin^-1(0.4) = sin^-1[1.2 - 4*0.064]
3sin^-1(0.4) = sin^-1[1.2 - 0.256]
3sin^-1(0.4) = sin^-1[0.944]
sin(3sin^-1(0.4)) = sin{sin^-1(0.944)} = 0.944
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