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Siderite is an ore of ______. ...
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If frac{{c + i}}{{c - i}} = a + ib, where a, b, c are real, then {a^2} + {b^2} = ...
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If coefficient of friction is 2/sqrt(3). What is the force of friction acting? ...
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If {( - 7 - 24i)^{1/2}} = x - iy, then {x^2} + {y^2} = ...