$1-2\cos^2a$
$\frac{4ax^{5}y^{7}}{7x^{2}y^{4}}$
$\int\left(\frac{\ln\left(y\right)^2}{y}\right)dy$
$-15-35.75+25$
$\sin\left(37.5\right)\cdot\cos\left(7.5\right)$
$\left(a+5\right)\left(a-3\right)$
$\frac{x}{18}=21$
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