$\left(\frac{4cos\left(-5x\right)}{cos\left(-7x\right)}\right)$

$2f^2+13f+15$

$csc\left(x\right)\left(sec\left(x\right)-\left(tan\left(x\right)\right)\left(sin\left(x\right)\right)\right)=cot\left(x\right)$

$\int sen\left(x^2+6x\right)\left(x+3\right)dx$

$4x^2\left(2x+3\right)^2+8x^2\left(2x+3\right)$

$\int x\cdot\sqrt{10x-x^2}dx$

$\frac{-70}{5}$