clarisse Posted January 6, 2006 Share Posted January 6, 2006 Hm (I know excuses, escuses but...) partly because it was my first day back to school and because I have a strong headache I just dont seem to understand what I'm suppose to be doing so I would appreciate if someone could just clarify it for me: the qu. says: Find the values of (thetha which i'll change to X) for which the following functions have a. max. values b. minimum values 2 sinX+cosX I differentiate first right? and then should i just solve for 2 cosX-sinX=0? Link to comment Share on other sites More sharing options...
cosine Posted January 6, 2006 Share Posted January 6, 2006 Right, and are you given a domain? Otherwise you technically have an infinite amount of values, but maybe they just want the first positive ones. Link to comment Share on other sites More sharing options...
timo Posted January 6, 2006 Share Posted January 6, 2006 ..., but maybe they just want the first positive ones. 2sin(x)+cos(x) has the same periodicity as sin(x) and cos(x) anyways so you can in fact identify all maxima and minima. Link to comment Share on other sites More sharing options...
clarisse Posted January 6, 2006 Author Share Posted January 6, 2006 Right, and are you given a domain? hm no but I suppose I have to give the general solution as a matter of fact i have the answer... just i dont think the reasoning is right because I tend to make up some impossible maths sometimes... I tell you, I get lost pretty quickly just after the differentiation Link to comment Share on other sites More sharing options...
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