To solve this problem you must apply the proccedure shown below:
1. You have the folllowing expression given in the problem above:
2. The first thing you must do is to factor the denominator, as following:
3. Now, simplify it and apply the distributive property in the denominator:
The answer is: 
The answer to this question is -61
Obtuse and isosceles
Isosceles means that at least two of the sides are congruent or equal.
Obtuse means that one angle of the triangle is greater than 90 degrees.
So, your answer is D and E
:)))
The tangent of 75 maybe? Depending on calculator tangent button then 75 or vice versa
