Question

I need help in math can you please help me

Answer 1

$\frac{\cos(u)\sec(u)}{\tan(u)}=(\cos (u)\sec (u))\mleft|\frac{1}{\tan (u)}\mright|$

The first box contains 1/tan(u)

$=(\cos (u)\frac{1}{\cos(u)})|\cot (u)|$

The second box constains cot(u). Now, simplifying cos(u) we have:

$=|\cot (u)|$

The last box contains cot(u)

I used "| |" to identify the boxes.