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A tower ABCD stands on a level ground wi...

A tower ABCD stands on a level ground with foot A. At a point P on the ground the portion AB,AC and AD subtends angles `alpha,beta,gamma` respectively. If AB=a,AC=b,AD=c,AP=x and `alpha+beta+gamma=180^(0)` then `(a+b+c)x^(2)=`
A) abc B) a+b+c C) a+b-c D) a-b-c

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