$b^7+1^7+n$

$3x+1=x+1$

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

$\left(2x+1\right)\:+\:\left(4x+1\right)$

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

$71a^3b+50a^3b+45a^3b$

$\lim_{x\to3}\left(\frac{\sqrt{x}-2}{x^2-9}\right)$