$-1+-13$

$\int\frac{sen\:x\left(sec\:x\right)}{cos\:x}dx$

$\frac{csc\left(x\right)-sin\left(x\right)}{cot\left(x\right)}$

$\int\left(\left(x^4-2x^2\right)^3\left(x^3-x\right)\right)dx$

$\frac{d}{dx}\left(sin4x+sin2y=1\right)$

$-3x^2-x+1=0$

$\left(4y-5\right)\left(7y+4\right)$