Q6 of 45 Page 131

Prove that:

Taking RHS





[As sec2θ -1 = tan2θ ]




= LHS


Proved.


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6

Prove that:

 6

Prove that:

sec4A (1– sin4A) – 2tan2 A = 1

 1

A person is standing at a distance of 80m from a church looking at its top. The angle of elevation is of 45°. Find the height of the church.

 2

From the top of a lighthouse, an observer looking at a ship makes angle of depression of 60°. If the height of the lighthouse is 90 metre, then find how far the ship is from the lighthouse. (√3 = 1.73)