Unfortunately, you start off by saying you "know" something that isn't true!

so . We have the trig identities and so , , , so that .

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- Jun 18th 2013, 12:27 PM #1

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- Jun 18th 2013, 01:54 PM #2

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- Jun 18th 2013, 03:53 PM #3

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- Jun 27th 2013, 11:42 AM #4

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