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9 August, 10:59

Find a ·

b. |a| = 80, |b| = 50, the angle between a and b is 3π/4.

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  1. 9 August, 14:45
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    A•b = |a|·|b|·cos (α)

    = 80·50·cos (3π/4) = - 2000√2
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