$3+1\cos\left(0\right)\cos\left(\frac{\pi}{3}\right)$
$-15+5\left(-2\right)$
$x^2+2x+25$
$-\left(3\right)\left(2x\right)^2\left(-\frac{3}{2}\right)$
$\left(6a-\frac{7}{4}b\right)^2$
$\frac{d}{dx}\:x^2+4x-5x^3sinx$
$\lim\:_{x\to\:+\:\infty\:}\frac{\left(3x-5\right)}{2x^2-x+2}$
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