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February 28, 2015

February 28, 2015

Posted by **kate** on Monday, January 25, 2010 at 3:47pm.

(a) cos 143 degrees

(b) tan 192 degrees

- pre calc -
**Reiny**, Monday, January 25, 2010 at 5:55pmI do these with the following steps:

cos 143

- which quadrant is it in? --- 2nd

- by CAST rule, what sign is the cosine in the 2nd? --- negative

- how far from 143º to the x-axis ? --- 37

so cos 143 = - cos 37

do the other one the same way.

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