$-15a^2-8b^2+22a\cdot\:2b-3a$
$2\cdot\left(3+-4\right)$
$\left(4t-v\right)dt\:+\left(2v-t\right)dv\:=0$
$\int x\left(sin\left(2x\right)cos\left(2x\right)\right)dx$
$\int\frac{\sqrt{x+25}}{x}dx$
$c^2<d^2$
$-16\cdot7$
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