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-- Mathematics - Section B2
Calculus
If $y=\frac{1}{2}x\sqrt{a^2-x^2}+\frac{a^2}{2}sin^{-1}\frac{x}{a},$ then $\frac{dy}{dx}=$
$\sqrt{a^2-x^2}$
$\sqrt{a^2+x^2}$
$\frac{1}{\sqrt{a^2-x^2}}$
$\frac{1}{\sqrt{a^2+x^2}}$