Show that 1+tan^2x = (cosx)^-2 where defined.

Don't have a clue what to do.

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- Mar 4th 2010, 09:53 AM #1

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- Mar 4th 2010, 10:11 AM #2

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- Mar 4th 2010, 10:45 AM #3

- Mar 4th 2010, 10:59 AM #4

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- Mar 4th 2010, 07:18 PM #5

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- Mar 4th 2010, 07:21 PM #6

- Mar 4th 2010, 07:28 PM #7

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- Mar 4th 2010, 07:37 PM #8

- Mar 4th 2010, 07:45 PM #9

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- Mar 4th 2010, 07:49 PM #10

- Mar 4th 2010, 07:50 PM #11

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- Mar 4th 2010, 07:51 PM #12

- Mar 4th 2010, 07:52 PM #13

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- Mar 4th 2010, 07:53 PM #14

- Mar 4th 2010, 08:39 PM #15

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