$\sin\left(x-\frac{\pi}{2}\right)=0$
$x+2\sqrt{2xy}+2y$
$log\left(2x+1\right)+log\left(x+2\right)$
$-9ab-2a+24ab-7ab-32a$
$\frac{d^2}{dx^2}\left(sin\left(5x\right)\cdot\cos\left(2x\right)\right)$
$\left(3x^4-5x^3\right)^2$
$-\left(\frac{54}{9}\right)$
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