$f^2+40-f^2$
$\frac{5\sec\left(x\right)}{\csc\left(x\right)}$
$\left(-90\right)\::\:\left(-15\right)$
$\frac{3^{-5}\cdot3^4}{9^{-1}}$
$\lim_{x\to\frac{\pi}{2}}\left(3\csc\left(2x\right)\right)$
$2.7\cdot3$
$\int_1^{\sqrt{s}}\left(\frac{s^2+\sqrt{s}}{s^2}\right)dx$
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