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## Main Question or Discussion Point

i know A.B = AB cos(x), and AxB = AB sin(x) ...

but if we face the problem didn't told us what should we use

then how to know what should we use

how to different scalar product or vector product.....??

but if we face the problem didn't told us what should we use

then how to know what should we use

how to different scalar product or vector product.....??

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