Monday
May 20, 2013

# Homework Help: Trig

Posted by Jon on Thursday, March 6, 2008 at 5:53pm.

Find the exact value of: sin405.

reference angle=225
sin225= -.707106781
= -.71

• Trig - drwls, Thursday, March 6, 2008 at 6:58pm

No. That isn't right.
sin 405 = sin 45 = + 0.70711
The reference angle is 45 degrees (405 -360) and you are in the first quadrant.

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