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क्या सदिशों का अदिश गुणनफल (Scalar Product) ऋणात्मक हो सकता है?

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सदिशों  \(\vec{A}\)  व  \(\vec{B}\) का अदिश गुणनफल  \(\vec{A}.\vec{B}=AB\ cos\theta\)  होता है। यदि θ का मान 90° से अधिक हो तो cosθ  का मान ऋणात्मक होगा, जिसके अनुरूप A. B का मान भी ऋणात्मक होगा। 

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