$\sin^2\left(\frac{x}{2}\right)=\frac{1-\cos\left(x\right)}{2}$
$2250.9\cdot3.27$
$a2+11a+36$
$x^4-17x^2+6$
$-41-\left(-19\right)$
$\frac{x^2+25-10x}{x^2-25}$
$\ln\left(2x^2\right)-\ln\left(2\right)=2$
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