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

Question

Find: a · b.

|a| = 80,    |b| = 50, the angle between a and b is 3π/4.
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Step 1

Write the expression a·b in terms of ...

ab-la|b|cos
...(1)
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ab-la|b|cos ...(1)

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