and from Pythagoras' theorem

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- Jan 24th 2010, 07:55 AM #1

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- Jan 24th 2010, 08:04 AM #2

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- Jan 24th 2010, 07:58 PM #3

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- Jan 25th 2010, 02:05 AM #4

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This is because of the range given,

Cosine locates the x co-ordinate of a point on the circle circumference.

Once you have discovered the "distance" the point is from the origin, you simply invert it in this case as the point lies to the left of the y-axis..

- Jan 25th 2010, 02:40 AM #5

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- Jan 25th 2010, 06:01 AM #6

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- Jan 25th 2010, 07:52 AM #7

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