anonymous
  • anonymous
double derivative of y = -5cosx be y'' = 5cosx or -cosx? I believe it's + cosx but I wanna make sure.
Mathematics
jamiebookeater
  • jamiebookeater
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myininaya
  • myininaya
And what did you get for y'?
anonymous
  • anonymous
y' = 5sinx . I'm assuming the - cancels out since it's already -.
myininaya
  • myininaya
y' is correct So what is derivative of sin(x)? And don't forget to bring our constant multiple down.

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myininaya
  • myininaya
And yes a negative times a negative is a positive.
anonymous
  • anonymous
cosx
anonymous
  • anonymous
cosx
myininaya
  • myininaya
Right so y''=5cos(x)

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