$3\left(-8\right)+28$
$\sec^2\left(1-\sin^2\right)=1$
$\left(5x^2y-10x^5y^3+15xy^4\right)$
$\left(+87\right)-\left(-18\right)-\left(-21\right)-\left(+112\right)$
$\frac{x^{3\:}+4}{x^2+4}$
$\left(2c^2+d^3\right)^3$
$y=\frac{1}{2}x^2-4x+6;x=-8$
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