$tan\left(x\right)=\frac{y}{x}$

$5x-9>12$

$\left(5x^4-3x^2+6x-3\right)-\left(-3x^4+x^3+5x^2-7x+3\right)$

$\lim_{x\to0}\left(\left(e^x+4x\right)^{\cot\left(3x\right)}\right)$

$3\cos^2\left(x\right)=5-7\sin\left(x\right)$

$x^2-3x+8=0$

$\int e^{\frac{x}{5}}sin\left(\frac{x}{10}\right)dx$