$\left(x-2y+3z+5\right)+\left(-3x+7y+2\right)$

$\left(1+e^t\right)y'+e^ty=e^t\left(1+e^t\right)$

$\int_0^{-\pi}\left(-\frac{7}{\pi}x\right)cos\left(nx\right)dx$

$\lim_{x\to-4}\left(\frac{x^2+x-12}{x+4}\right)$

$3\sin\left(4x\right)\cos\left(4x\right)$

$17=\frac{m}{12}$

$\int cosxcos7xdx$