can you help me solving this question without using L'HOPITAL'S RULE
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just put
If you know anything about derivatives ... In general: Imagine: and
Originally Posted by Krizalid just put OK , I put I got the following restul !!
Originally Posted by razemsoft21 OK , I put I got the following restul !! use the identity and then the limit
Originally Posted by o_O If you know anything about derivatives ... In general: Imagine: and Since the question is posted in PRE-Calculus it might be IF rather than if ....
Originally Posted by razemsoft21 OK , I put I got the following restul !! Use so
Originally Posted by o_O If you know anything about derivatives ... In general: Imagine: and Thank you for help, it works: razemsoft21 o_O definition of f'(pi/4) = -2cos(pi/4).sin(pi/4) = -1 the same result when I use L'HOPITAL'S RULE
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