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    A linear Algebra Problem (3x3 Matrix)

    f Sorry it is my bad. Thanks!
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    A linear Algebra Problem (3x3 Matrix)

    Homework Statement I want to proove the determinant of the following 3x3 matrix is 0. 1 1 1 tanA tanB tanC tan2A tan2B tan2C where A+B+C=2pi...
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