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80. By which angle the coordinate axes must be rotated tomake equation 5x^2 +8xy +5y^2+3x +2y+5 freefrom 'xy' term?

Answer» 80. By which angle the coordinate axes must be rotated tomake equation 5x^2 +8xy +5y^2+3x +2y+5 freefrom 'xy' term?


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