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?

Answers

Answered by Steve
sin(19π/12) = sin(3π/2 + π/12) = -cos(π/12)

Now use the half-angle formula to evaluate that.
Thank you!
Answered by Anonymous
tan(-15)
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