1.

3sin inverse=sin inverse(3x-4x cube)

Answer» I think the question is

To prove     3arcsinx = arcsin(3x-4x^3)

Let x= sin A , then A = arcsinx so  LHS = 3A

and RHS = arcsin (3sinA-4sin^3A) = arcsin(sin3A)=3A

So LHS = RHS


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