$\frac{3.8}{2}$
$100-17$
$\int5xcos\left(x^2\right)dx$
$x^2-5x+7+3x^2+2x-2$
$x^2-50x+336$
$\left(x^{2n}-y^{3n}\right)\left(x^{2n}+y^{3n}\right)$
$\csc\left(x\right)=-1.57$
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