$\lim_{x\to1}\sec\left(x\right)$

$\frac{27x^{-10.666}}{9y^{14}}\left(\frac{15y^{-3}}{6x^2}\right)$

$\frac{\left(3x^2-5x+1\right)}{\left(x-4\right)}$

$x^2-3x+6$

$-3\left(5^2+-3\right)+2\left(5-1^3\right)-3^2+5$

$\int\frac{500}{\sqrt{\left(100e^{6x}+400\right)}}dx$

$\int x^32\cdot\cos\left(8x\right)dx$