Posted by **Courtney** on Monday, March 25, 2013 at 5:03pm.

How do I use the unit circle to evaluate tan(-3pi/4)

- Trig -
**Steve**, Monday, March 25, 2013 at 5:09pm
draw the circle and the line at the given angle. The intersection will give you a point (x,y).

in this case, the line is at an angle of 45 degrees, in QIII, where y=x.

tan (-3pi/4) = (-1√2)/(-1/√2) = 1

## Answer This Question

## Related Questions

- Trig - Solve: 3tan^2x-1=0. I got +/- (the sq. root of 3)/3 which is correct ...
- Trig.... - use specific triangles and the unit circle to geth the values. tan(...
- trig - if tan x= 4/3 and pip < x < 3pi/2, and cot y= -5/12 with 3pi/2 <...
- Trig - check my answers plz! - 1. (P -15/17, -8/17) is found on the unit circle...
- trig - Let be an angle in standard position and the point (a, b) be the point ...
- Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...
- trig - Sketch a unit circle and label the terminal points corresponding to t= pi...
- trig - Solve the equation for cos theta-tan theta=0 for greater than or egual to...
- Trig - Solve the trig equation exactly over the indicated interval. tanθ = ...
- Math - Could someone explain the steps for this question. Simplify the ...

More Related Questions