$\int a^2\cos\left(a\right)da$
$15\:9-15-9$
$6ax^2+21ax+9a$
$\frac{d^2}{dy^2}\left(x^4\:y^2-x^3\:y\right)$
$-\frac{1}{2}+3-5+\frac{3}{2}$
$5y^2-2y^3-7y^2+4y^3$
$x+10x+2x$
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