$\frac{-\cos\left(2\right)}{\sin\left(x\right)}=2\sin\left(x\right)-\csc\left(x\right)$
$7^6\cdot7^{-4}$
$24x^2+16x-4x^4$
$\left(-102\right)+\left(899\right)$
$-5\:+\:9n\:+\:6$
$c\left(x+y+z\right)-\left(x+y+z\right)$
$16-25x^2$
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