$\frac{9x^2}{4}+30xy+100y^2$
$-21-\left(-16\right)$
$64x^2-8$
$3t-t^2$
$\cot2x-\csc2x$
$\int\sec^2\left(8x^2\right)xdx$
$3-_{\left|-8\right|}$
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