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cwrw238

  • 3 years ago

I seem to have a mental block with this problem - can someone help please. If x = sin t and y = cos 2t find dy/dx in terms of x and prove that d^2y / dx^2 + 4 = 0.

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  1. cwrw238
    • 3 years ago
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    i've got as far as finding dy/dx in terms of t.

  2. Yahoo!
    • 3 years ago
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    x = sin t dx / dt = cos t y = cos 2t dy/dt = -2sin2t

  3. Yahoo!
    • 3 years ago
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    dy/dx = -2sin2t / cos t

  4. Yahoo!
    • 3 years ago
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    dy/dx = (dy / dt )/(dx/dt)

  5. cwrw238
    • 3 years ago
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    ahhh - ok my stupidity i got dy/dt wrong!!!!

  6. cwrw238
    • 3 years ago
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    thanks yahoo

  7. Yahoo!
    • 3 years ago
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    Welcome...)

  8. cwrw238
    • 3 years ago
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    my brains in low gear today....

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