self Maths Puzzle

pand q are the two points observed from the top of a building 10root3 m high.if the angle of depression of the points are complementary and pq=20 m then the distance of p from the buildling?

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self Other Question

if 13+2=18
25+4=53
67+5=2
then
46+3=?
if A and B are the complementary angles, then the value of sinA cosB + cosA sinB - tanA tanB + sec^2A - cot62B is