$5\sqrt{784}$

$dy=\left(xy-3x\right)dx$

$\frac{secxsinx}{tanx}-1$

$\int\frac{\tan^3\left(x\right)}{\sec^4\left(x\right)}dx$

$-3-5\cdot9$

$50x^2+60x+18$

$\frac{\cos\left(x\right)}{\sin\left(x\right)}-\frac{\sin\left(x\right)}{\cos\left(x\right)}=2\cot\left(2x\right)$