Pre-Calc : Find the Exact Value of the Expression

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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?

  • Pre-Calc : Find the Exact Value of the Expression -

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

    Now use the half-angle formula to evaluate that.

  • Pre-Calc : Find the Exact Value of the Expression -

    Thank you!

  • Pre-Calc : Find the Exact Value of the Expression -

    tan(-15)

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