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anonymous

  • 5 years ago

how to solve dy/dx: cos*2X

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  1. anonymous
    • 5 years ago
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    derivative of cos (chain 2x)

  2. anonymous
    • 5 years ago
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    sin2x*2

  3. anonymous
    • 5 years ago
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    Are you sure, Starica is getting ready to correct you

  4. anonymous
    • 5 years ago
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    awww i thought we r to find dy/dx :S

  5. anonymous
    • 5 years ago
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    you just derive the outside and inside ^_^ outside = cos inside 2x so dy/dx of cos = -sin and dy/dx of 2x = 2 soooo, dy/dx cos(2x) = -2sin(2x)

  6. anonymous
    • 5 years ago
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    o_o... but wasn't she right?

  7. anonymous
    • 5 years ago
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    no i missed the negative sign

  8. anonymous
    • 5 years ago
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    isn't it finding the derivative of cos(2x)?

  9. anonymous
    • 5 years ago
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    lol, it's alright :)

  10. anonymous
    • 5 years ago
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    i guessed it so

  11. anonymous
    • 5 years ago
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    you were close =P

  12. anonymous
    • 5 years ago
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    thanks:p

  13. anonymous
    • 5 years ago
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    np ^_^, do you get it now sandip?

  14. anonymous
    • 5 years ago
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    no its finding the derivative of cos^2x

  15. anonymous
    • 5 years ago
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    OH! so the question is: \[\frac{dy}{dx} \cos^2(x)\]?

  16. anonymous
    • 5 years ago
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    ya

  17. anonymous
    • 5 years ago
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    alright so we have 2 steps, first outside then inside, our outside here is the power and the inside is cos(x) so dy/dx = - 2cos(x) sin(x) ^_^

  18. anonymous
    • 5 years ago
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    but star ...dont u think it must b y= cos^2x n find dy/dx??

  19. anonymous
    • 5 years ago
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    yeah lol

  20. anonymous
    • 5 years ago
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    wasn't I right? o_o

  21. anonymous
    • 5 years ago
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    ... Go by the definition of the chain rule. \[Let\ (cos\ x)^2 = f(g(x))\] What is our f(x), what is our g(x)?

  22. anonymous
    • 5 years ago
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    she/he doesn't get the chain rule >_< lol

  23. anonymous
    • 5 years ago
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    in a much simpler way do it this way: cos(x) . cos(x) u'v + uv' ^_^ and solve

  24. anonymous
    • 5 years ago
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    I hope this way helps though :)

  25. anonymous
    • 5 years ago
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    alright gtg, later ^_^

  26. anonymous
    • 5 years ago
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    he-she isn't going to be able to do any of the rest of their homework if they don't understand the chain rule. This is a good opportunity to learn the chain rule since you need it to solve this problem.

  27. anonymous
    • 5 years ago
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    What can I say. Star likes manual labor.

  28. anonymous
    • 5 years ago
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    lol, I'm just trying to get it clear for him/her ^_^?

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