# circular functions help.

• Jul 6th 2008, 07:06 AM
Dave19
circular functions help.
determine the value of the following if 0 is less than or = to theta and theta is less than 2 pie.

1) sin theta = -1 = this is my answer im not sure if it's right though= 3 pie/2

2) sec theta= -2root3/3=
• Jul 6th 2008, 07:13 AM
kalagota
Quote:

Originally Posted by Dave19
determine the value of the following if 0 is less than or = to theta and theta is less than 2 pie.

1) sin theta = -1 = this is my answer im not sure if it's right though= 3 pie/2

yes correct..

Quote:

Originally Posted by Dave19
2) sec theta= -2root3/3=

note: $\displaystyle \sec \theta = \frac{1}{\cos \theta}$ this means that $\displaystyle \cos \theta = \frac{-3}{2\sqrt{3}} = \frac{-\sqrt{3}}{2}$
• Jul 6th 2008, 07:28 AM
Dave19
is it just 7 pie/6 or is it 5pie/6 and 7pie/6
• Jul 6th 2008, 06:45 PM
kalagota
Quote:

Originally Posted by Dave19
is it just 7 pie/6 or is it 5pie/6 and 7pie/6

both since the only restriction is $\displaystyle 0 \leq \theta < 2\pi$..