$\left(\sec\left(x\right)\right)\left(\cos\left(x\right)+\sin^2\left(x\right)\sec\left(x\right)\right)$
$\frac{7^2}{7^2}$
$\left(6m-3n\right)\left(6m+7\right)$
$\left(x-5\right)\left(x+5\right)-\left(x+6\right)\left(x-6\right)$
$y^{\prime\prime}-2y^{\prime}-y=0$
$\sin\left(90-x\right)=0.8$
$\left(2mn-5\right)\left(2mn+5\right)$
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