$3\left(\left(a+b\right)b\right)$

$li\lim_{x\to1}\frac{\sqrt{x}-1}{\sqrt{x+3}-2}$

$\cot\left(a\right)=\frac{1}{\tan\left(a\right)}$

$\log\left(\frac{10x^3\left(x+4\right)}{\left(x-3\right)\left(x+2\right)}\right)$

$\frac{\tan\left(x\right)-\cos\left(x\right)}{\tan\left(x\right)}=\frac{\tan\left(x\right)}{\sec\left(x\right)}$

$0,62\cdot1$

$\frac{500}{q+2};q=104$