CBSE Class 10 Maths (Basic) 2022 · Paper 430/1/1 · Question 9
In Figure 2, the angles of elevation of the top of a tower AB of height 'h' m, from two points P and Q at a distance of x m and y m from the base of the tower respectively and in the same straight line with it, are and , respectively. Prove that .
Answer
Since and , multiplying gives , as required.
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