$2.8-1.9$
$-23-\left(-17\right)$
$2cot^2a+csc^2a=2$
$\frac{y}{2}\left(10y+30\right)$
$\int sin\left(7x\right)cos\left(5x\right)dx$
$x^2+10x-56$
$\frac{6}{2x}$
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