Hi, there--

The Problem

Simplify this expression.


There is some ambiguity about what parts of the expression you mean to by the "over." 
This is the expression that I simplified. If this is not your expresso, feel free to email me back 
and I'll resolve.

Solution:
Substitute sin(A)/cos(A) for tan (A).


Cancel like terms in the numerator and denominator.


Simplify the double division in the third term.


Substitute 1/cos(A) for sec(A).


Combine like terms.


Cancel like terms in the numerator and denominator.


Substitute cot(A) for cos(A)/sin(A)


All the Best,
Mrs.Figgy
math.in.the.vortex@gmail.com