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Under what condition the dot product of...

Under what condition the dot product of two vectors is maximum or minimum ?

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`vecA.vecB=AB cos theta`
Dot product is maximum when `theta=0`
`vecA.vecB=AB`
Dot product is maximum when `theta =180^(@)`
`vecA.vecB=AB cos 180^(@) =-AB`
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MODERN PUBLICATION-MOTION IN A PLANE -Revision Exercises (Short Answer Question)
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