$\frac{1-cos^2\left(a\right)}{cos^2\left(a\right)}$
$\frac{2\cdot6}{4}-30$
$3\left(x-y\right)+b\left(x-y\right)$
$\int6sec^2\left(3x\right)tan\left(3x\right)dx$
$1000x^3-125y^3$
$\left(-7-\left(-10\right)\right)\cdot8$
$\left(7x\right)^2$
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