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Mathematics 10 Online
OpenStudy (anonymous):

True of False? The sine of a 30 degree angle is equal to the cosine of a 60 degree angle

OpenStudy (phi):

see http://www.mathsisfun.com/geometry/unit-circle.html and scroll down to "important angles"

OpenStudy (phi):

they expect to memorize the sin, cos and tan of these special angles.

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