$\frac{1-\sin\left(a\right)}{1+\:\sin\left(a\right)}=\sec^2\left(a\right)-2\sec\left(a\right)\tan\left(a\right)+\tan^2\left(a\right)$
$5x^2-14x+8$
$\frac{2x+6}{3x}=x-8$
$\cos\left(x\right)dx+\sin\left(x\right)dy+\frac{2\sin\left(x\right)}{y}dy=0$
$\left(5n^3+3n^2\right)^3$
$\left(-15\right)\left(3\right)\left(6\right)\left(-2\right)$
$\left(2x-4y\right)\cdot\left(2x+4y\right)$
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