Homework Help: trig

Posted by charly on Wednesday, April 14, 2010 at 8:34pm.

using the fact that 5pi/8=1/2(5pi/8) and the half angle identity for cos to find the exact (in terms of radicals) value of cos(5pi/8)

No one has answered this question yet.

Answer this Question

Related Questions

Trig - Find the exact value of tan 5pi/12 using the half-angle identity.
trig - find the exact value by using the appropriate half-angle identity: sin(...
Calculus - Find the area in the first quadrant bounded by the arc of the circle ...
trig - Find the exact value by using a half-angle identity. cos 22.5 degrees
math - use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have...
math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...
math - use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I ...
math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...
Precalculus check answers help! - 1. Which expression is equivalent to cos ...
trig - 2sin(x)cos(x)+cos(x)=0 I'm looking for exact value solutions in [0, 3...

For Further Reading

First Name:
School Subject:
Answer: