Friday

January 30, 2015

January 30, 2015

Posted by **Stephanie** on Tuesday, March 22, 2011 at 7:30pm.

#1 cos (27pi/8)

- trig -
**Damon**, Tuesday, March 22, 2011 at 8:17pm27 pi/8 = 3 pi + 3 pi/8

that is 180 degrees + 67.5 degrees

that is in quadrant 3 where cos is negative

so

-cos 3 pi/8 radians

or

-cos 67.5 degrees

**Answer this Question**

**Related Questions**

trig - Find the trigonometric function value of angle θ. Cos θ = 2/7 ...

trig - Find the exact value of the trigonometric function given that sin u = &#...

TRIG/ALGEBRA - 1) Find the exact value. Use a sum or difference identity. tan (-...

Alg2/Trig - Find the exact value of the trigonometric function given that sin u...

Math - Trying to understand an inverse trig function. Evaluate Cos^-1 (sqr3/2) ...

Math(Correction) - Use the given function values and trigonometric identities (...

Math(Correction) - Use the given function values and trigonometric identities (...

Trig - If sec A =5/4 and A is an angle in Quadrant IV, find the value of cos A. ...

Pre Calc - evaluate the trigonometric function of the given quadrantal angle. ...

Math - Use the given function values and trigonometric identities (including ...