$-5+\left(-5n\right)+10$

$\frac{dy}{dx}\left(ln\left(cosh\left(5v\right)\right)-\frac{1}{2}tanh^2\left(5v\right)\right)$

$\frac{dy}{dx}=\frac{x^3+1-xy}{x^2}$

$-7,8+0,6$

$\frac{d}{dx}\:y^2\:+\:5=\frac{x^2}{x+y}$

$\left(-4\right)\left(-5\right)\left(-3\right)$