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please help me everyone . what is the derivative of:
f(t)=20[1cos^2(t/1000pi)]
 one year ago
 one year ago
please help me everyone . what is the derivative of: f(t)=20[1cos^2(t/1000pi)]
 one year ago
 one year ago

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DoritosHeroBest ResponseYou've already chosen the best response.1
Yes that would be the case if pi was in the numerator, but I think you said pi was in the denominator though?
 one year ago

4thiefBest ResponseYou've already chosen the best response.0
\[f(t)=20[1\cos^2(\frac{ t }{ 1000\pi })\] like that ^
 one year ago

4thiefBest ResponseYou've already chosen the best response.0
\[\frac{ \sin(\frac{ x }{ 500\pi }) }{ 50\pi }\] is this your answer?
 one year ago

DoritosHeroBest ResponseYou've already chosen the best response.1
\[f(t) = 20  20\cos ^{2}(t/(1000\pi))\] \[f'(t) = 0  20 * 2\cos (t/(1000\pi)) * \sin (t/(1000\pi)) * (1/(1000\pi))\] \[f`(t) = 20/1000\pi * 2\cos(t/1000\pi)*\sin(t/1000\pi)\] Use identity sin (2x) = 2sinxcosx \[f'(t) = 1/50\pi * \sin (2*t/1000\pi)\]
 one year ago

4thiefBest ResponseYou've already chosen the best response.0
that acually looks right to me. ^
 one year ago

DoritosHeroBest ResponseYou've already chosen the best response.1
You can also check your answers by punching the equations into wolframalpha.com
 one year ago

DoritosHeroBest ResponseYou've already chosen the best response.1
No problem, good luck!
 one year ago
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