Assertion: If `theta` be the angle between `vecA` and `vecB` then `tan theta=(vecAxxvecB)

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Assertion: If `theta` be the angle between `vecA` and `vecB` then `tan theta=(vecAxxvecB)/(vecA.vecB)` Reason: `vecAxxvecB` is perpendicular to `vecA.vecB`
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