$a^2+2a+1$

$\left(p+5^2\right)$

$\int\left(\frac{1}{\sqrt{4x^2-4}}\right)dx$

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

$f^2-1.4+0.49$

$\frac{x^3-5x^2+3x+9}{x-1}$

$arctan\left(x\right)=2arctan\left(\frac{x}{1+\sqrt{1+x^2}}\right)$