In the standard (x,y) coordinate plane b...

In the standard (x,y) coordinate plane below, an angle is shown whose vertex is the origin. One side of this angle with measure `theta` passes through (4, -3), and the other side include the positive x-axis. What is the cosine of `theta`?

`- 4/3`

`-3/4`

`-3/5`

`4/5`

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