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Question

Two sides of a triangle are formed by the vectors a=3^i+6^j2^k and b=4^i^j+3^k. The angles of the triangle are
1) cos1775

2 cos1(2675)
3) cos1315
4 cos123

A
1 & 4
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B
2 & 3
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C
3 & 4
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D
1 & 2
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