cwrw238
  • cwrw238
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.
Mathematics
katieb
  • katieb
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cwrw238
  • cwrw238
i've got as far as finding dy/dx in terms of t.
anonymous
  • anonymous
x = sin t dx / dt = cos t y = cos 2t dy/dt = -2sin2t
anonymous
  • anonymous
dy/dx = -2sin2t / cos t

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anonymous
  • anonymous
dy/dx = (dy / dt )/(dx/dt)
cwrw238
  • cwrw238
ahhh - ok my stupidity i got dy/dt wrong!!!!
cwrw238
  • cwrw238
thanks yahoo
anonymous
  • anonymous
Welcome...)
cwrw238
  • cwrw238
my brains in low gear today....

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