$\left(1+\csc\left(a\right)\right)\left(1-\csc\left(a\right)\right)=-\cot\left(a\right)$
$4a^2-2ab$
$y=\sqrt{\frac{x-2}{x^4+2}}$
$\lim_{x\to0}\left(\frac{\sec\left(2x\right).\tan\left(3x\right)}{5x}\right)$
$\frac{d}{dx}\left(\sqrt{\frac{\left(x-4\right)}{x^4+2}}\right)$
$\frac{5a+b}{b}$
$984+-685$
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