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Equation of line in Straight lines

Question

Acute angle, in radians  between the lines whose slope is 2 and the line which is perpendicular to the line 2xy+5=0  is

Easy
Solution

The slope of the line  2xy+5=0  is m=ab=2  , it is same as the slope of the first line. 
Hence the angle between the line whose slope is 2 and the line which is perpendicular to the line 2xy+5=0   is   π2=1.57
 



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