cos(a, -B) cos(a, -B) cos(a, -B)
16. If 4 = cos(a, -B) cos(a, -B2) cos(a, -B)
cos(az - B.) cos(a, --B) cos(az - B;)
then A equals
1) cosa, cosa, cos az cos B, cos B, cos ß,
2) cosa, + cos a2 + cos &z +
cos B, + cos B, +cos B,
3) cos(a, - B) cos(az - B2) cos(az - B;)
4) 0
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