$\lim_{x\to\frac{\pi}{4}}\left(\frac{1-tan\left(x\right)}{sin\left(x\right)-cos\left(x\right)}\right)$

$3t+7t^2-t$

$1^7$

$\lim_{x\to\infty}\left(\frac{7x^2+2x}{7x^3+9x+6}\right)$

$\left(1-f\right)\left[y\:+\:\left(1-z\right)y\right]+f$

$\int\left(x^3\right)e^{9x}dx$

$\int\frac{10x+8}{x^2-49}dx$