find the locus of a point equidistant from the lines x+y+4=0 and 7x+y+20=0.
a tree stands vertically on a hill side which makes an angle of 15 degree with the horizontal. From a point on the ground 35m down the hll from the base of the tree,the angle of elevation of the top of tree is 60 degree. Find the height of the tree.
If sinQ + cosQ = 1, then prove that sin2Q = 0.
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