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Find the equation of the line passing through the point(1,2,3) and parallel to the line `(x-1)/2=(7-y)/3=-z`.

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UNITED BOOK HOUSE-SET 7-EXERCISE
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  10. If y = tan^(-1) ((sqrt(1+x^2)-sqrt(1-x^2))/(sqrt(1+x^2)+sqrt(1-x^2))) ...

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