$-\frac{2}{3}x-2$
$\left(49-340\right)\cdot3$
$\left(cotx+cscx\right)\left(tanx-senx\right)=tanx\cdot\:\:senx$
$x^2<-9$
$\lim_{x\to\infty}\left(\frac{sen3x+3cos3x}{10e^x}\right)$
$\int_0^1\left(e^{2y-1}\right)dy$
$2\csc^2x=4$
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