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The Lengths of Two Vectors a and B, and the Angle

Question 58

Essay

The lengths of two vectors a and b, and the angle between them, are given. Find the length of their cross product, ∣a×b∣| \mathbf { a } \times \mathbf { b } |
. ∣a∣=4,b∣=5,θ=60∘| \mathbf { a } | = 4 , \mathbf { b } \mid = 5 , \theta = 60 ^ { \circ }

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