3 years ago

Find a · b. |a| = 4, |b| = 7, the angle between a and b is 2π/3

Mathematics

1 answer:

galben [10]3 years ago

5 0

Answer:

-14

Step-by-step explanation:

a·b = |a|×|b|×cos(angle between them)

= 4×7×(-1/2)

= -14

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