$\sin\left(\frac{\pi}{2}-x\right)+\sin\left(x\right)\cdot\tan\left(x\right)$
$\int x^2\sqrt{ax^3+b\:}dx$
$\frac{2}{\cos\left(x\right)}=\sec^2\left(x\right)$
$3x^2+25x-30\le0$
$\frac{\sin\left(x\right)-\csc\left(x\right)}{\csc\left(x\right)}=-\cos^2\left(x\right)$
$2-\left(7+5-6\right)$
$-12+\left(-\sqrt[2]{64}\right)+\left(-17\right)+4$
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