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| 1. |
A line makes an angle alpha, beta, gamma and delta with the diagonals of a cube, prove that cos^2alpha + cos^2beta + cos^2gamma + cos^2delta =4/3 |
| Answer» A line makes an angle alpha, beta, gamma and delta with the diagonals of a cube, prove that cos^2alpha + cos^2beta + cos^2gamma + cos^2delta =4/3 | |