$\frac{14}{6}\left(\frac{2}{5}\right)\left(5\frac{3}{7}\right)$

$2\cdot a+2\cdot a$

$\int_{-x}^x\left(xy+y-2\right)e^{2x}dx$

$x^8-2x^7-x^6$

$-\left(15+23\right)+98-7+\left(-13+5+4-7\right)$

$\frac{\sec\:^2\left(x\right)\left(\cot\:^2\left(x\right)\right)}{\csc\:^2\left(x\right)}=\tan\:\left(x\right)$

$6cos^23x-7cos3x-3=0$