$3\sin\left(x\right)\tan\left(x\right)=\tan\left(x\right)$
$-\left[-a+\left\{-a+\left(a-b\right)-\left(a-b+c\right)-\left[-\left(-a\right)+b\right]\right\}\right]$
$\frac{sec\:\left(x\right)}{1-sin\left(x\right)}=\frac{1+sin\left(x\right)}{cos^3\left(x\right)}$
$\lim_{x\to a}\frac{\left(sec\left(x\right)-sec\left(a\right)\right)}{x-a}$
$\left(-7\right)\:-\:3^2$
$\int2\left(1+tan^2\left(a\right)\right)da$
$\left(r+x\right)^3$
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