$-19-\left(4-13\right)$
$8a^2+2b^2-64a^2+16a^2+2b+b^2$
$\frac{x}{x^{2}}$
$\frac{\left(x^4+2x^3+x^2-8x-20\right)}{\left(x-2\right)}$
$\frac{3}{2}x+3x$
$8\cos\left(x\right)^2\:+\:10\cos\left(x\right)=13\:-\:5\sin\left(x\right)^2$
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