$9xy+3x$
$\left(sec\left(x\right)+\tan\left(x\right)\right)\left(1-\frac{sin\left(x\right)}{\cos\left(x\right)}\right)=1$
$\arcsec\left(2.30\right)$
$\int xe^{-5t}dx$
$\cos\left(75\right)\cos\left(15\right)+\sin\left(15\right)\sin\left(75\right)$
$3.2\sqrt{18}$
$\cos\left(x-7\right)-3\sin\left(x-7\right)$
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