$\frac{\tan^2x}{\sec x}\left(\sec x-\cos x\right)$
$\left(e^{2x\:e-2x}\right)^{10}$
$31-\left(-11\right)$
$-12,43+9,43$
$x^2+26x+14$
$4x^2-12xy+4y^2$
$16-\left(-25-3\right)$
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