CPM Homework Help : PC3 Problem 6-12

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6-12.

Determine the exact values of the following trigonometric expressions.

$\cos\left(\frac{3\pi}{4}\right)$
Hint (a):
Sketch a unit circle with a $45^\circ-45^\circ-90^\circ$ triangle in Quadrant II.

$\sin\left(\frac{11\pi}{6}\right)$
Hint (b):

$\sin\left(-\frac{2\pi}{3}\right)$
Hint (c):

$\tan\left(\frac{5\pi}{4}\right)$
Hint (d):
Sketch a unit circle with a $45^\circ-45^\circ-90^\circ$ triangle in Quadrant III.

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