$36x^2+84x-49$
$\int9cot^4xdx$
$-\left(x+h\right)^4$
$2\cdot13+2\left(-13\right)$
$x\:+\:2y-3z=4$
$n^4+2n^2-3mn$
$\left(1+a+b\right)\left(1+a-b\right)$
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