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July 31st, 2017, 06:47 AM   #1
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Equivalent Expressions (Trig)

Help!!!!!!!!!!!!!!!!!!!!!!!!
What is the equivalent expression of:

cos (pi/2 + x)/cos (pi + x)
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July 31st, 2017, 07:02 AM   #2
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Quote:
Originally Posted by izziedora View Post
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.
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July 31st, 2017, 02:25 PM   #3
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