$\sin\left(100\right)\cos\left(50\right)-\cos\left(100\right)\sin\left(50\right)$
$x+4-5x-2$
$15-\sqrt{5}\cdot\sqrt{5}$
$3\left(97\right)$
$9c+1=10$
$y^2-0$
$-3\sqrt{2}+\sqrt{2}$
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