Posted by mike on Thursday, July 8, 2010 at 1:49am.
25 xy is a factor of all terms.
-125x^3y -75xy^2 +100x^3y^3
= 25xy*(-5x^2 -3y +4x^2y^2)
cos2A=?
Post trigonometry questions separately.
Look for "Post a New Question".
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