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If the lines 3x - 4y + 4 = 0 and 6x - 8y - 7 = 0 are tangents to a circle, then the radius of the circle is ...
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The IUPAC name of {{left( C{{H}_{3}} ight)}_{3}}C-OH is ...
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The roots of the equation {7^{{{log }_7}}}^{({x^2} - 4x + 5)} = x - 1 are ...