Find the angle between the straight lines x-2y+1=0 and x+3y=2
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tan@= m1-m2/1-m1m2
tan@= 1/2-(-1/3)/1+1/2×1/3= 1/2+1/3/7/6=5/7
@= tan^-1(5/7)
tan@= 1/2-(-1/3)/1+1/2×1/3= 1/2+1/3/7/6=5/7
@= tan^-1(5/7)
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