$\lim_{x\to\infty}\left(\frac{x^2}{cos^2\left(n-1\right)-\left(n+1\right)^2}\right)$
$\left(d^2+3d-15\right)y=0$
$25x^2-10x+8$
$9xy+3x$
$\sin^{4}\theta+\sin^{2}\theta\cos^{2}\theta$
$6+-3x$
$\left(3x-8\right)^2-\left(3x+8\right)^2$
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