PQ is a vertical tower. A,\ B,\ C are three points in a horizontal line through Q, the foot of the tower. lf the ang

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Q 3020691511.     PQ is a vertical tower. A,\ B,\ C are three points in a horizontal line through Q, the foot of the tower. lf the angles of elevation of the top of the tower from A,\ B,\ C are \alpha,\ \beta,\ \gamma representively. Then  BC\cot\alpha-CA\cot\beta+AB \cot \gamma=
A

3

B

1

C

2

D

0

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