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Increasing/Decreasing intervals for Trig  TOPIC_SOLVED

Q: Let f(x)=20x-10sin(4x) for 0<=x<=pi/2 Find the largest interval(s) over which the function f is increasing or decreasing. I tried to solve this: f'(x)=20-40cos(4x) =20(1-2cos(4x)) on keeping f'(x)=0, i get x=pi/12 I just cannot get correct intervals to work properly with my online math homework s...
by ronny3050
on Fri Oct 12, 2012 2:57 am
 
Forum: Calculus
Topic: Increasing/Decreasing intervals for Trig
Replies: 6
Views: 3232

Re: Increasing/Decreasing intervals for Trig  TOPIC_SOLVED

I did differentiate that! The problem is with the intervals!


Could you please solve it?


Thank you!
by ronny3050
on Fri Oct 12, 2012 7:20 pm
 
Forum: Calculus
Topic: Increasing/Decreasing intervals for Trig
Replies: 6
Views: 3232

Re: Increasing/Decreasing intervals for Trig  TOPIC_SOLVED

Sorry to bug you again but my function was f(x)=20x-10sin(4x)
After taking the derivative I get f'(x)=20-10*4*cos(4x) = 20-40cos(4x)

So, I did take the derivate of 4x!
by ronny3050
on Sat Oct 13, 2012 2:29 am
 
Forum: Calculus
Topic: Increasing/Decreasing intervals for Trig
Replies: 6
Views: 3232

Re: Increasing/Decreasing intervals for Trig  TOPIC_SOLVED

Matt, thanks a zillion! :clap:
by ronny3050
on Sat Oct 13, 2012 5:29 am
 
Forum: Calculus
Topic: Increasing/Decreasing intervals for Trig
Replies: 6
Views: 3232

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