$5\cos\left(2x\right)-3\sin\left(2x\right)\cdot\tan\left(x\right)$
$-3x-x^2$
$12x^2+24xy+72x-12=0$
$\int\frac{5}{3x^4-9x^2-12}dx$
$\int\frac{3+2x}{2x-15+x^2}dx$
$450+450+450$
$u'=-3u-1+x^2$
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