If sec 2θ = cosec (θ – 36°), where 2θ is an acute angle, find the value of θ.

This question was previously asked in
SSC CGL 2022 Tier-I Official Paper (Held On : 05 Dec 2022 Shift 1)
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  1. 32° 
  2. 46°
  3. 20°
  4. 42°

Answer (Detailed Solution Below)

Option 4 : 42°
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Detailed Solution

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Given:

sec 2θ = cosec (θ – 36°)

Concept used:

image

Calculation:

sec 2θ = cosec (θ – 36°)

⇒ sec 2θ = sec (90° – θ + 36°)

⇒ sec 2θ = sec (126° – θ)

⇒ 2θ = 126° – θ

⇒ 3θ = 126°

θ = 42°

∴ The required answer is 42°.

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