8.) simplify.
cot^2 0 - cot ^2 0 cos ^2 0
a.) tan^2 0
b.) -1
c.) 3
d.) sin ^2 0
e.) cos^2 0

The answer to your question is letter E. cos²α

Step-by-step explanation:

                            cot²Ф  - cot²Фcos²Ф

Remember that    cot = ; substitute in the previous equation

                                                      Factor  cos²α

Remember that   sin²α = 1 - cos²α

Simplify

                              cos²α

squares, rhombus, rectangles

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right