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This can be solved using expansion of sin-1x and tan-1x which followssin^(-1)x=x+1/6x^3+ 3/(40)x^5+5/(112)x^7+(35)/(1152)x^9+...tan^(-1)x=x - 1/3x^3 + 1/5x^5 – 1/7x^7+...When you will substitue and put limit you can easily get the answer.
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