# Tangent Graphing Question

1. Oct 10, 2006

### Johnnycab

Why does the period of a tangent function = 180 degrees, and the sine and cosine functions have periods of 360 degrees. Also i dont understand why asymptotes are included in the tangent graph, and not the other two

If someone could clarfy this for me id be very thankful

2. Oct 10, 2006

### quasar987

It is because the tan(x) function is a ratio of sin(x) and cos(x).

As x gets near $\pi/2}$, cos(x) gets very near from 0, while sin(x) gets near 1. So tan(x) near $\pi/2}$ gets very big, hence the assymptote at $\pi/2}$. The same phonomenon explain the other assymptotes.