and from Pythagoras' theorem

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- January 24th 2010, 08:55 AM #1

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- January 24th 2010, 09:04 AM #2

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- January 24th 2010, 08:58 PM #3

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- January 25th 2010, 03:05 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..

- January 25th 2010, 03:40 AM #5

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- January 25th 2010, 07:01 AM #6

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- January 25th 2010, 08:52 AM #7

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