$1+tan\:x-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=\tan\left(x\right)$
$-\frac{90xyz}{-10y}$
$7 x - 10 x ^ { 2 } + 15 x ^ { 2 }$
$4sec^2\left(x\right)=sec\left(x\right)$
$6m^2+4m-2;\:m=-5$
$-120+82-13$
$a\left(x+4\right)+b\left(x+4\right)+c\left(x+4\right)$
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