$\frac{1}{sin\left(x\right)}+\frac{1}{cos\left(x\right)}=\left(cos\left(x\right)+sin\left(x\right)\right)\left(sec\left(x\right)\right)\left(csc\left(x\right)\right)$

$c^2-14c-49$

$-2.31\:-\left(-5.9\right)$

$\left(2ab\right)\left(3ab^1\right)$

$\frac{x-1}{x+1}-\frac{x+3}{x}=2$

$\left(3xy-4y^2z\right)^2$

$\lim_{x\to\infty}\left(\frac{x^2+7x+12}{x^2+6x-27}\right)$