Prove that `sin(3sin^-1(1/3)) = 23/27`

1.	Prove that `sin(3sin^-1(1/3)) = 23/27`
Answer» LHS `sin(3sin^(-1)(1/3))` `Let sin^(-1)(1/2)=x` `sin(3x)=3sinx-4sinn^3x` `=3*1/3-4(1/3)^3` `=1-4/27` `=23/27` RHS.

Discussion

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