$\tan\theta=\frac{\sec\theta}{\csc\theta}$
$\frac{15}{x^2+3x-4}$
$\sqrt[4]{16x^2y^8}$
$\left(n-3\right)\left(n-25\right)$
$\left(\frac{x^2-x-12}{x^2-9}\right)\left(\frac{3+x}{4-x}\right)$
$-579+1230$
$\frac{x+3}{x}<7$
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