Question

What is the y-intercept of the graph of `y = cos x`?

Answer 1

The y-intercept of this function is the point where the line "crosses" the y-axis. In other words, it's where "x" is 0. That makes this easy to find; all you have to do is plug in 0 for x to get y.

`y = cos x`

`y = cos (0)`

`y = 1`

So the y-intercept is 1.