If sinQ + cosQ = 1, then prove that sin2Q = 0.
find the equation of the line through the intersection of the lines x+2y-3=0 and 4x -y+7=0 and which is parallel to 5x +4y -20=0.
Find an increasing A.P in which the sum of the first 3 terms is 27 and the sum of their squares is 275?
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