$tan\left(t+v\right)=\frac{tan\:t\:+\:tan\:v}{1-tan\:t\:tan\:v}$
$6x^2y+2x^2y$
$\lim_{x\to0}\left(\frac{\left(tanx\:+cosx-1\right)}{cos\left(x+1\right)}\right)$
$\int\left(\left(x^3-3x\right)\right)\left(e^{6x}\right)dx$
$2x=-26$
$\int x\cdot e^{3x+1}dx$
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