$\frac{sin\:x}{sec\:x-1}+\frac{sin\:x}{sec\:x+1}=2\:cot\:x$
$1+3+8d+5+7$
$a^2-2a-15$
$\int\frac{\left(u^2+1\right)}{u^4+1}du$
$-9-\left(14-9\right)$
$\int\left(x-7\right)^{12}dx$
$\left(2x-4y\right)^2-3\left(x^2+y\right)$
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