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
= -
= -
Which situation represents the greatest percent of change?
1 answer:
You might be interested in