13. If vectors A, B and C have magnitudes 8, 15 and 17
units and A + B = c, find the angle between A and
B.
(Ans. 909)
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Answer:
how could be an angle 909
Explanation:
A+B=√(A^2+B^2+2ABcos∆)
A+B=C
use these two equation
may be it helps you
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