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steel11

  • 3 years ago

find line tangent to y=xcosx at point (pi, -pi)

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  1. pitankar
    • 3 years ago
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    tangent is -1

  2. steel11
    • 3 years ago
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    just typed y=-1 in. says incorrect

  3. pitankar
    • 3 years ago
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    the equation should be y = -x

  4. steel11
    • 3 years ago
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    yep, ty.

  5. pitankar
    • 3 years ago
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    this is how I calculated it. y = xCosx is the function. taking it's derivative gives the slope to be dy/dx = cosx, which when evaluated at x =pi gives -1. now equation of line is y=mx+c, we know m=-1 and putting y = -pi and x = pi we get c =0. thus the equation of line tangent to the curve is y =-x

  6. steel11
    • 3 years ago
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    ok

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