$4cos^2\left(a\right)-3$

$\int\left(\frac{sin\left(x\right)}{e^{p\cdot x}}\right)dx$

$\frac{d}{dx}\left(2y^3+4xy+x^2\right)=7$

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

$11+3x>11$

$\frac{25x^4b^2}{5x^2b}$

$\frac{di}{dt}=\left(b-y\right)\cdot i-\frac{b}{n}\cdot i^2$