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November 28, 2014

November 28, 2014

Posted by **Sophie** on Friday, August 14, 2009 at 9:16pm.

Evaluate tan 7.5

Part 2)

Evaluate exactly cos (-(45pi(4)))

- Trig problems -
**drwls**, Friday, August 14, 2009 at 9:53pm1. I recommend usng a calculator (in radians mode) or search Google with

< tan 7.5 = > in the search window.

2. Remember that you can subtract multiples of 2 pi from the argument of any trig function and get the same answer.

-45 pi*4 = -180 pi; the cosine of that is the same as the cosine of zero.

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