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05-10-2011   #1 (permalink)
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Default Need help with a trig problem.

Hello everyone! Could someone help me with this trig problem?

Use the fundamental identities to simplify the expression.
cos [(π/2) - x]sec x

Thanks in advance.

Last edited by Pathos; 05-10-2011 at 02:14 PM.
 
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05-10-2011   #2 (permalink)
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sec x = 1 / ( cos x )

cos ( .5π - x ) = cos ( 90 - x ) = sin x

Plug that in and you get
sin x / cos x
tan x

At least make it seem like you tried... You have internet access and thus you have a list of identities at your disposal. It's just plugging stuff in from there. Not very hard.
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