$\frac{1}{1-tan\left(x\right)}-\frac{1}{1+tan\left(x\right)}=-\tan\left(x\right)$
$45+6+\left(-1\right)$
$\left(4c^2+2d\right)\left(4c^2d\right)$
$\left(315\right)\left(312\right)$
$\cos\left(-180-x\right)$
$3x^m+\frac{3}{x^m}$
$\left(2x-6\right)\left(2x-2\right)$
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