$15-5\cdot3+4$
$\frac{1}{sin\left(x\right)}-\frac{1}{csc\left(x\right)-cot\left(x\right)}=-\tan\left(x\right)$
$a+3-a+4$
$\int\frac{x^2+2x}{x\left(x+1\right)^2}dx$
$m^2-24m$
$\int\frac{s}{\left(s-1\right)s+3}dx$
$-36\left|-12\right|$
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