$4\cos\left(k\right)=6\tan\left(k\right)$
$\int\frac{x^2-3}{e^{6x}}dx$
$x^3-4x^2+2x+x$
$4sen2xcos2x$
$\left(a^9+a^7+3\right)\left(x+3\right)$
$\lim_{x\to0}\left(-\frac{6e^{2x}-6}{e^x-1}\right)$
$12x^2-9x=0$
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