$8x^{4\:}-30x^3+13x^2+18x-9$
$\int cosbx\:dx$
$\frac{\cot x}{\cos x}$
$16+x=12$
$1-5x+3x$
$-17+x=-19$
$\int\frac{1}{x\sqrt{64x^2+49}}dx$
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