# Negative in the CAST Diagram

• Jan 1st 2011, 01:31 PM
watp
Negative in the CAST Diagram
Hi again,

If $-sinx=0$, where would it be on the CAST diagram? Would it be in the bottom quadrants (so 180, 270?)

Also, if it's $\frac{2}{3}$ for sin, would it be the top quadrants?

Thanks
• Jan 1st 2011, 01:37 PM
pickslides
Quote:

Originally Posted by watp

If $-sinx=0$, where would it be on the CAST diagram? Would it be in the bottom quadrants (so 180, 270?)

Thanks

In the unit circle $-\sin x = 0$ between quadrants, it has the same solution to $\sin x = 0$ , draw both functions on the same set of axes, you will see!

Quote:

Originally Posted by watp

Also, if it's $\frac{2}{3}$ for sin, would it be the top quadrants?

Thanks

Correct, for $\sin x = \frac{2}{3}, x\in (0,\pi)$

Yep.