Question

Lim 1 to 3 (x2+2x+3)dx

Find the equation of the line which is at a distance of 3 units from the origin such that tan a =5/12,where a is the acute angle which this perpendicular makes with positive direction of the x-axis. 

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in the figure if angle 2=120 and angle 5=60. show the m//n

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