i know A.B = AB cos(x), and AxB = AB sin(x) ...(adsbygoogle = window.adsbygoogle || []).push({});

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

**Physics Forums | Science Articles, Homework Help, Discussion**