x = (sec θ - cos θ) (cot θ + tan θ) കൂടാതെ y = sec θ(sec θ + tan θ)(1 - sin θ) ആണെങ്കിൽ, 0° < θ < 90° ആയാൽ xy ന് തുല്യമായത് ഏതാണ്?

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RRB Group D 2 Sept 2022 Shift 1 Official Paper
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  1. tan θ sec θ
  2. cot θ
  3. cosec θ cot θ
  4. sin θ

Answer (Detailed Solution Below)

Option 1 : tan θ sec θ
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RRB Group D Full Test 1
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Detailed Solution

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നൽകിയത്:

x = (sec θ - cos θ) (cot θ + tan θ)

y = sec θ(sec θ + tan θ)(1 - sin θ)

കണക്കുകൂട്ടൽ:

⇒ xy

⇒ (sec θ - cos θ) (cot θ + tan θ) x sec θ(sec θ + tan θ)(1 - sin θ)

\(\frac{(1 - cos^2 θ) (cos θ + sin θ)}{cos θ sin θ} \) x \( \frac{(1+ sin θ)(1 – sin θ)}{cos^2 θ}\)

\(\frac{(sin^2 θ) }{cos^2 θ sin θ} \) x \( \frac{(1- sin^2 θ)}{cos^2 θ}\)

⇒ tan θ sec θ x 1

⇒ tan θ sec θ

അതിനാൽ ഓപ്ഷൻ 1 ശരിയായ ഉത്തരമാണ്.

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