explain simple so i can understand this is precalculus

Question

Without using a calculator, compute the sine and cosine of $\frac{5 π}{6}$ by using the reference angle.

What is the reference angle? ___- radians.

In what quadrant is this angle?___ (answer 1, 2, 3, or 4)

$\sin (\frac{5 π}{6}) =$

$\cos (\frac{5 π}{6}) =$

Raymond B. · Accepted Answer

5pi/6 = 150 degrees.  That's quadrant II.  (1/6)pi = 30 degreessin150 = sin30 = 1/2cos150 = -cos30 = -(1/2)sqr3

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