$\left(x+4\right)\left(x^2-5x+6\right)$

$\lim_{x\to0}\left(\frac{e^x\left(e^y-1\right)}{y}\right)$

$\int\left(5^{\frac{2}{3}}+\frac{2e^x}{3}\right)dx$

$1-20x^2+100x^4$

$\frac{\cos\left(-x\right)}{\sec\left(-x\right)}$

$6^2+12\cdot5+5^2$

$4\cos\left(2x\right)+3\cos\left(x\right)=-4$