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.
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cwrw238
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i've got as far as finding dy/dx in terms of t.
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x = sin t
dx / dt = cos t
y = cos 2t
dy/dt = -2sin2t
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dy/dx = -2sin2t / cos t
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dy/dx = (dy / dt )/(dx/dt)
cwrw238
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ahhh - ok my stupidity i got dy/dt wrong!!!!
cwrw238
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thanks yahoo
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Welcome...)
cwrw238
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my brains in low gear today....