anonymous
  • anonymous
Please help anyone...see attachment
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Mertsj
  • Mertsj
Did you find the first derivative?
anonymous
  • anonymous
I came up with -5sin(-π)-5cos(-π) / (sin (-π) + cos(-π)^2 so far.... :)

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Mertsj
  • Mertsj
You did the bottom times the derivative of the top. then you must subtract the top times the derivative of the bottom. That is the numerator of the derivative.
anonymous
  • anonymous
Like this 5*[cos(x)-x*cos(x)+sin(x)+x*sin(x)]/([cos(x)+sin(x)]^2)?
Mertsj
  • Mertsj
Yes
Mertsj
  • Mertsj
Now plug in -pi
anonymous
  • anonymous
yup and i get -5sin(-π)-5cos(-π) / (sin (-π) + cos(-π)^2... not sure if that's right
Mertsj
  • Mertsj
What is the sin of -pi?
anonymous
  • anonymous
0
Mertsj
  • Mertsj
What is the cos of - pi?
anonymous
  • anonymous
-1
Mertsj
  • Mertsj
Plug those values in and evaluate.
anonymous
  • anonymous
Oh thanks
Mertsj
  • Mertsj
yw

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