$\sin\left(2x\right)\cos\left(y\right)-\cos\left(2x\right)\sin\left(y\right)$

$\sqrt{25\cdot\:64}$

$\ln\left(y\right)=\ln\left(\frac{15}{4\left(x+3\right)^4}\right)$

$\lim_{x\to0}\left(\frac{\cos\left(\pi.x\right).\pi}{x}\right)$

$\int_0^{\infty}\frac{50e^{2t-1}}{1+e^{2t-1}}dt$

$\int\frac{x-3}{x^2-6x+5}dx$

$\frac{dy}{dx}=-\frac{y}{\left(x+2\right)\left(x+1\right)}$