$cos\left(a+90\right)$
$\frac{x^4-13x^3+2x^2-5x+9}{x^2-1}$
$9p^2q^2-16r^2$
$\arcsin\left(1.3217\right)$
$\int a\cos\left(bx+c\right)dx$
$\lim_{x\to\infty}\left(e^x-\frac{e^x}{x+1}\right)$
$8-3\left(2+9\right)$
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