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Find the angle between the pair of lines...

Find the angle between the pair of lines `(x-5)/7=(y+2)/(-5)=z/1` and `x/1=y/2=z/3`

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Find the angle between the pair of lines (x-2)/2=(y-1)/5=(z+3)/(-3) and (x+2)/(-1)=(y-4)/8=(z-5)/4

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Find the angle between the lines (x-3)/2=(y-5)/3=(z+5)/4 and (x+3)/1=(y-4)/2=(z-5)/1 .

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OMEGA PUBLICATION-HP BOARD MARCH 2017-SERIES -C
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