$2x\:x=2$
$\frac{2x^2+10x^4-3x^3+2x^2-6}{2x^5}$
$\left(-5a^2b\right)\left(3a^4b^2\right)$
$+1-\left(-4+3-1\right)-4+4$
$4a^2b-5ab^2+a^2b-ab^2$
$\frac{\sin\left(x\right)-\cos\left(x\right)}{-\sin\left(x\right)}$
$2-9+17-10$
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