Talk:Rotation of axes

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When you are doing the derivation for the rotation formula and then you expand it in the second step, where do all your C - terms go? Where is the Cx'sin@^2 + Cy'cos@^2 + 2Cx'y'sin@cos@ ?? It is missing! Jkeesh 22:50, 6 March 2007 (UTC) JKEESH

And the expansion of the terms in the derivation is missing the D term or parentheses and the expansion is just basically wrong. Jkeesh 22:58, 6 March 2007 (UTC) JKEESH

you have a mistake in your rotation formula:

x = x'cos(theta) - y'sin(theta) is right, but

y = x'cos(theta) + y'cos(theta) is wrong, coeff. for x' should be sin(theta)

< this is obvious, how can you have 3 cos(theta) in the equations, symmetry is destroyed!>

Is there a quicker way to calculate the rotated equation instead of having to use all those annoying substitutions? —Preceding unsigned comment added by 70.250.214.9 (talk) 12:25, 22 April 2008 (UTC)