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Question
Choose the correct alternative answer for the following question.
Options
angle of elevation.
angle of depression.
0
straight angle.
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Solution
When we see at a higher level, from the horizontal line, angle formed is angle of elevation.
Hence, the correct answer is angle of elevation.
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Proof: L.H.S. = (sec θ – cos θ) (cot θ + tan θ)
= `(1/square - cos θ) (square/square + square/square)` ......`[∵ sec θ = 1/square, cot θ = square/square and tan θ = square/square]`
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= tan θ.sec θ
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∴ L.H.S. = R.H.S.
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