Posted by **Anonymous** on Thursday, January 26, 2012 at 11:14pm.

Determine if the value of each trig function is positive, negative, zero, or undefined.

a) tan 310 degrees

b) cos 7pi/6

c) sin -245 degrees

d) sec( -7/2)

- trig -
**Reiny**, Friday, January 27, 2012 at 8:29am
Determine in which quadrant you are in,

then use the CAST rule

e.g.

sin(-245°)

= sin( 115°) , (going 115 counterclockwise is the same as going 245° clockwise )

115° is in quad II

in quad II , sine is positive, so

sin(-245°) is positive

you can always check with your calculator.

in sec(-7/2) , remember that if no units are stated, radians are assumed.

so -7/2 is coterminal with 2π - 7/2 which is appr 2.78

## Answer This Question

## Related Questions

- trig 26 - simplify to a constant or trig func. 1. sec ²u-tan ²u/cos ²v+sin ²v ...
- trig help much appreciated! :)) - 1. Find the complete exact solution of sin x...
- Trigonometry - Please review and tell me if i did something wrong. Find the ...
- calculus - 1. what trig function has an amplitue of 1 and negative values for ...
- Trig - What is the exact value of cos 40 degrees cos 50 degrees minus sin 40 ...
- Algebra II - Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...
- math - Eliminate the parameter (What does that mean?) and write a rectangular ...
- Trig functions - 1)Write the equation sin y= x in the form of an inverse ...
- MathsSs triG - Consider sin(x-360)sin(90-x)tan(-x)/cos(90+x) 1.A.SIMPLIFY sin(x-...
- Math- Trig - 1. Determine the exact value of cos^-1 (pi/2). Give number and ...

More Related Questions