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December 18th, 2016, 09:28 AM   #1
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Question Why is sin(3.6) NEGATIVE?

Why is sin(3.6) negative? It makes no sense. It should be positive between -90 and 90 degrees.
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December 18th, 2016, 10:03 AM   #2
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Perhaps you meant between 0 and 90 degrees, but 3.6 radians exceeds 180 degrees.
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December 18th, 2016, 10:40 AM   #3
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Quote:
Originally Posted by flaby View Post
Why is sin(3.6) negative?
Because $\pi < 3.6 < \dfrac{3\pi}{2}$ ... 3.6 radians lies in quadrant III where sine values are negative.

If you meant to calculate $\sin(3.6^\circ) = 0.06279...$, then change your calculator from radian to degree mode.
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