Problem
We need to find the y intercept of this function
y=-1/2cos(3/2x)
Solution
The y intercept correspond to the value of x=0 of the function and we can do this:
y= -1/2 cos (3/2 *0)
y= -1/2 cos (0) = -1/2
And then the best solution it would be:
x=0 and y= -1/2
(0,-1/2)