sin(19π/12) = sin(3π/2 + π/12) = -cos(π/12)
Now use the half-angle formula to evaluate that.
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?
3 answers
Thank you!
tan(-15)