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Assuming n to be negative , express the ...

Assuming n to be negative , express the equation of the straight line lx+my+n=0 in the normal form.

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The correct Answer is:
`(l)/(sqrt(l^(2)+m^(2))).x+(m)/(sqrt(l^(2)+m^(2))).y=-(n)/(sqrt(l^(2)+m^(2)))`
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