$\frac{dy}{dx}=\tan\left(x\right)y-\cos^2\left(x\right)$
$\int sen\left(lnt\right)dt$
$\frac{3^3+x^3}{3+x}$
$\left(x^2-x^{-2}\right)^4$
$\left(2sinx+2cscx\right)\left(3sin^2x+3csc^2x-3\right)$
$a^2+3a^2+8a^2$
$196 b ^ { 2 } - 121$
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