$\lim_{x\to0}\left(\frac{\left(\ln\left(1+\sin\left(x\right)\right)-x\right)}{\cos\left(x\right)-1}\right)$

$-4\cdot25$

$\frac{dy}{dx}=5x^2y^2$

$\int\frac{2x^4+3x^3-20x-28}{2x^3-x^2-8x+4}dx$

$y=\frac{x^3}{21}+\frac{7}{4x},x=1,x=2$

$sea\:f\left(x\right)=x^{\frac{3}{2}}$

$\int_0^{\frac{\pi}{3}}\left(\frac{1}{\cos\left(x\right)^2}\right)dx$