SOLUTION: Find a new representation of {{{11x^2-50sqrt(3)xy-39y^2+576=0}}} after being rotated through an angle of 60 degrees. The question asks for the coefficient of {{{x^2}}}. I get -64,

Question 1141738: Find a new representation of after being rotated through an angle of 60 degrees. The question asks for the coefficient of . I get -64, but not sure if that's right. Thank you! Your work is much appreciated!
Answer by math_helper(2461) (Show Source): You can put this solution on YOUR website!
-64 is correct.
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For
rotated counter-clockwise by :

The leading coefficient in the rotated coordinates is:
A' =
=

=
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