$\frac{1}{\left(1-x^2\right)^2},\:a=0$
$3x-7y=3y-7x$
$-4\cdot14$
$4\sec\left(x\right)+4=-2\sec\left(x\right)-8$
$8y\:+\:5\:-\:2y$
$7\left(cos210+isin210\right)$
$x^2-16x+48$
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