\(\rm \sqrt {\frac{{1 + \cos \theta }}{{1 - \cos \theta }}} + \sqrt {\frac{{1 - \cos \theta }}{{1 + \cos \theta }}} \) = .

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SSC CGL 2022 Tier-I Official Paper (Held On : 05 Dec 2022 Shift 2)
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  1. 2 பாவம் θ
  2. 2 காஸ் θ
  3. 2 கோசெக் θ
  4. 2 நொடி θ

Answer (Detailed Solution Below)

Option 3 : 2 கோசெக் θ
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Detailed Solution

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கொடுக்கப்பட்டது:

\(\rm \sqrt {\frac{{1 + \cos \theta }}{{1 - \cos \theta }}} + \sqrt {\frac{{1 - \cos \theta }}{{1 + \cos \theta }}} \)

பயன்படுத்தப்பட்ட கருத்து:

1. பாவம் θ = 1/கோசெக் θ

2. பாவம் 2 θ + காஸ் 2 θ = 1

3. (a + b)(a - b) = a 2 - b 2

கணக்கீடு:

\(\rm \sqrt {\frac{{1 + \cos θ }}{{1 - \cos θ }}} + \sqrt {\frac{{1 - \cos θ }}{{1 + \cos θ }}} \)

⇒ \(\sqrt {\frac{(1 + \cos θ)^2}{(1 - \cos θ)(1 + \cos θ)}} + \sqrt {\frac{(1 - \cos θ) ^2}{(1 - \cos θ)(1 + \cos θ)}} \)

⇒ \(\sqrt { \frac{(1 + \cos θ)^2}{1 - \cos^2 θ} } + \sqrt {\frac{(1 - \cos θ)^2}{1 - \ விலை^2 θ}} \)

⇒ \(\sqrt { \frac{(1 + \cos θ)^2}{sin^2 θ} } + \sqrt {\frac{(1 - \cos θ)^2}{sin^2 θ}} \)

⇒ \({ \frac{(1 + \cos θ)}{sin θ} } + {\frac{(1 - \cos θ)}{sinθ}} \)

\({ \frac{(1 + \cos θ + 1 - \cos θ)}{sin θ} }\)

\({ \frac{2}{sin θ} }\)

⇒ 2 கோசெக் θ

∴ எளிமைப்படுத்தப்பட்ட பதில் 2 cosec θ ஆகும்.

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