$\frac{1+\sec\left(a\right)}{\sec\left(a\right)}$
$2^3-\left(-1\right)^4$
$\frac{d}{dx}2\cos-2$
$\left(y-6\right)\left(y+15\right)$
$\lim_{x\to0}\left(x\right)\tan\left(x\right)$
$6y+1<0$
$\frac{d}{dx}\left(\:5x^2+3y-x=2\right)$
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