Posted by Phil HELP NEEDED ASAP on .
Find the exact value of the expression without a calculator:
sin(3π/4+5π/6)
I've done:
sin(9π/12 + 10π/12)
=sin(19π/12)
What do I do now? Im confused if that would just be the answer or what? Wouldnt the answer be numerical?

PreCalc : Find the Exact Value of the Expression 
Steve,
sin(19π/12) = sin(3π/2 + π/12) = cos(π/12)
Now use the halfangle formula to evaluate that. 
PreCalc : Find the Exact Value of the Expression 
Phil HELP NEEDED ASAP,
Thank you!

PreCalc : Find the Exact Value of the Expression 
Anonymous,
tan(15)