Posted by **George** on Wednesday, January 23, 2013 at 3:08pm.

Thank you STEVE!!!!!

Suppose that Cos (theta) = 1/square root 2

if 0<equal to theta , pi/2 then

sin(theta) =

tan (theta) =

If 3pi/2 less than equal to theta , 2pi then

sin(theta) =

tan (theta) =

I know the trig functions but I feel like I am missing something here. cos (theta) = adj/hyp sin(theta) = opp/hyp...im getting confused with the numbers I am getting..can you help me solve these?

- Trigonometry -
**Steve**, Wednesday, January 23, 2013 at 3:18pm
always draw diagrams in the correct quadrants for this kind of stuff.

You know that if cosθ = 1/√2, θ = 45°, and the triangle has sides 1,1,√2

So, in QI, x and y are both positive, and

sinθ = y/r = 1/√2

tanθ = y/x = 1/1 = 1

In QIV, x>0 and y<0, so

sin = y/r = -1/√2

tan = y/x = -1

## Answer This Question

## Related Questions

- Calculus - I wanted to confirm that I solved these problems correctly (we had to...
- Trigonometry - Prove the following identities: 1. (tan theta - sin theta)^2 + (1...
- Trigonometry - Prove the following identities: 1. (tan theta - sin theta)^2 + (1...
- trig - If sin theta is equal to 5/13 and theta is an angle in quadrant II find ...
- trigonometry - can you correct the rest for me please? Express each as a ...
- trigonometry - can you correct the rest for me please? Express each as a ...
- Math Trig Help - sin theta = x/3, with theta in the first quadrant, find the ...
- Algebra II - Which of the following expressions are not equal to 1? A) sin^2 ...
- Algebra II - Multiple Choice Which expression is NOT equivalent to 1? (theta) ...
- Precalculus(NEED HELP ASAP PLEASE!!) - cot(theta)= 3 pi < theta < 3pi/2 ...

More Related Questions