Pre-Calc : Find the Exact Value of the Expression
posted by Phil-- HELP NEEDED ASAP on .
Find the exact value of the expression without a calculator:
sin(9π/12 + 10π/12)
What do I do now? Im confused if that would just be the answer or what? Wouldnt the answer be numerical?
sin(19π/12) = sin(3π/2 + π/12) = -cos(π/12)
Now use the half-angle formula to evaluate that.