What do you mean by direction cosines?

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Sarvajeet Kumar

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X = ai + bj + ck; l=cos A=a/square root (square of a+square of b +square of c); m=cos B=b/square root (square of a+square of b +square of c); n=cos C=c/square root (square of a+square of b +square of c) l, m, n are called direction cosines of the vector X.
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