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Originally Posted by threewingedfury
actually its like m is a subscript - lol I might have said it wrong - sorry so x(m as subscript)
and for the cross product - i forgot it was ab x sin(theta) - so thats no prob
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well, in the first one - so that quantity x_m is a scalar constant,
not a variable. that's pretty important when calculating the derivative. i get a different answer on the first one from yours, but i suspect that we're very close in reasoning. what are you using for the derivative function?
note, for the cross product - the formula you gave is for the
magnitude of the cross product, but that is not the same as the answer for A x B. A x B is a vector quantity.