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January 30, 2015

January 30, 2015

Posted by **Blaire** on Sunday, March 2, 2014 at 6:29pm.

- Math -
**Damon**, Sunday, March 2, 2014 at 6:40pmtan^2 = sin^2/cos^2 = s^2/c^2

(s^2/c^2+1)(c^2-1) = s^2 -s^2/c^2 +c^2 -1

but s^2 + c^2 = 1

so we have

-s^2/c^2

= -(1 - c^2)/c^2

= - 1/c^2 + 1

= 1 - sec^2

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