Answer:
cosA = - 
Step-by-step explanation:
Using the double angle identity
cos2A = 2cos²A - 1 , then
cosA = 2cos²(
) - 1 , that is
cosA = 2 × (
)² - 1
= 2 ×
- 1
=
- 
= - 
Answer:
Step-by-step explanation:
the answer is 25 paycheck's
The statement is totally false.

because (P and ¬P) is a contradiction.