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 July 31st, 2017, 05:47 AM #1 Newbie   Joined: Jul 2017 From: Fayetteville, NC Posts: 2 Thanks: 0 Equivalent Expressions (Trig) Help!!!!!!!!!!!!!!!!!!!!!!!! What is the equivalent expression of: cos (pi/2 + x)/cos (pi + x)
July 31st, 2017, 06:02 AM   #2
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Quote:
 Originally Posted by izziedora Help!!!!!!!!!!!!!!!!!!!!!!!! What is the equivalent expression of: cos (pi/2 + x)/cos (pi + x)
apply the formula

$\cos(a+b) = \cos(a)\cos(b) - \sin(a)\sin(b)$

and simplify.

 July 31st, 2017, 01:25 PM #3 Newbie   Joined: Jul 2017 From: Fayetteville, NC Posts: 2 Thanks: 0 Thanks

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