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What is the reference angle of sin(-45)?

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Apr 26, 2015

Assuming you mean #-45# radians, the reference angle is #14pi - 45#

#45 -: 2 pi ~~ 7.16# and

#14 pi ~~ 43.98#

So, to get #-45# that only leaves about #-1.02# which is a 4th quadrant angle with reference angle #1.02#.

The exact value is #14pi - 45#

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