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STATEMENT-1 : Ifl, m, n are direction ratios of a straight line then minimum value of l^(2) + m^(2) + n^(2) will be 1. STATEMENT-2 : If the line joining the origin to the point (0, -1, 9) makes angles alpha, beta and gamma eith the positive direction of the axes then the value of cos 2 alpha + cos2beta +cos2gamma is -1 STATEMENT-3 : The angle between two lines that have the direction ratios (1, 2, 3) and (3, -2, 1) is cos^(-1)(1/7). |
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