$-\left(cos\left(y+x\right)+cos\left(y-x\right)\right)$
$\int\frac{x}{\sqrt{x^2+10}}dx$
$\int\sqrt{7x+3}dx$
$u^2+2u^2+u+2$
$a^2+18a+16$
$\left(3x+2y\right)\left(2x+4y\right)$
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