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Find a⋅b. |a| = 80, |b| = 90, the angle between a and b is 3π/4.

Find a⋅b. |a| = 80, |b| = 90, the angle between a and b is 3π/4.

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Find a ⋅ b . | a | = 80 , | b | = 90 , the angle between a and b is 3 π 4 . ◻

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