Mathematics

Mathematics

Problem

If α,β,γ\alpha, \beta, \gamma be the direction angles of a vector and cos⁡α=1415\cos \alpha = \frac{14}{15}, cos⁡β=13\cos \beta = \frac{1}{3} then cos⁡γ=\cos \gamma = (a) ±215\pm \frac{2}{15} (b) 15\frac{1}{5} (c) ±115\pm \frac{1}{15} (d) None of these

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