you know that cos(x) = -1 at x = π,3π,5π, ...
So, we can check
7π = 21.99
9π = 28.27
Looks like C to me
Which of the following best corresponds to the x-value where the function f(x)=cos x is a minimum in the interval x = [25,30]?
A) 25.1
B)26.7
C)28.3
D)29.8
Can someone show me how to solve this step by step? Thanks :)
1 answer
1 answer