$\frac{\sec\left(x\right)}{x\csc\left(x\right)}$

$\int\frac{\left(5x^3-4x^2+3\right)}{\left(x^2-x\right)}dx$

$\int215e^{215x}dx$

$\int_0^{\frac{\pi}{2}}\left(15cos\left(5t\right)cos\left(10t\right)\right)dx$

$8x^2-12xy+6xy-9y^2$

$3\left(x-4\right)=15$

$\frac{8\sin\left(x\right)\cos\left(x\right)}{\sin\left(4x\right)+2\sin\left(2x\right)}$