$\frac{d}{dx}2^x$
$D=\frac{[\left(\sen\theta+\cos\theta\right)^{2}-1]\csc\theta}{2\cos\theta}$
$14x^2-15x-4$
$\int_0^2\left(x-b\right)^{-2}dx$
$1\ge-z$
$x+2\cdot2$
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