$\lim_{x\to0}\ln\left(x+y\right)\sin\left(xy\right)$

$\int\frac{x^2+1}{\sin^2\left(x^3+3x\right)}dx$

$-3+2\left|\left(-5-4\right):-9+\left(3+6\right)\right|+6$

$\int_{\frac{\pi}{4}}^{\frac{\pi}{2}}cot^5xdx$

$5.6\cdot\left(-1.5\right)$

$\ln\left(\sqrt{\cos\left(2x\right)}\right)$

$x^4-2x^2-15$