$-\left(-14\right)-\left(-7\right)+\left(-13\right)+2$

$16y^2+14.0013468013467=-25.8730274688522$

$\left(16x^3y\right)\left(9x^2-4y^2+6xy\right)$

$\int_1^n\left(\frac{x}{x^2-x-6}\right)dx$

$sin\left(x\right)cos^2\left(y\right)dx-cos\left(x\right)sin\left(y\right)dy=0$

$\left(\frac{2}{3}x^2y^2-1\right)\left(\frac{2}{3}x^2y^2+1\right)$

$\lim_{x\to\frac{\pi}{2}}\left(\cos\left(x\right)\right)^{\left(\frac{\pi}{2}-x\right)}$