$\int3xcos2x.dx$

$\left(3x\right)^3-3\left(3x\right)^2\left(1\right)+3\left(1ab\right)\left(5\right)^2+\left(5\right)^3$

$\int\left(\frac{1-\sin\left(x\right)}{x+cos\left(x\right)}\right)dx$

$\left(\frac{6g^5}{3g}\right)^3$

$7\cdot\left(-6+9\right)-3\cdot\left(14-9+1\right)$

$\frac{2x^5-4x^4+8x+6}{2x-1}$

$\int2+\tan\:^2\left(x\right)dx$