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$$ \arctan\left(\frac{x}{\sqrt{a^2-x^2}}\right)$$

Hi, I am not able to solve this problem from last 1 hour. Please help me to solve this question. As I can solve simple inverse trigonometric functions.

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    Set $x = a \sin(\phi)$, and simplify the argument of the $\arctan$. Are you assuming $0?2012-08-23

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