sinθ − 3 sin θ + 2 = 0 எனில், θ (0° ≤ θ ≤ 90°) இன் மதிப்பைக் கண்டறியவும் .

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SSC CGL 2022 Tier-I Official Paper (Held On : 12 Dec 2022 Shift 2)
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  1. 45°
  2. 60°
  3. 90°

Answer (Detailed Solution Below)

Option 4 : 90°
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கொடுக்கப்பட்டது:

sinθ − 3 sin θ + 2 = 0.

பயன்படுத்தப்பட்ட கருத்து:

1. -1 ≤ sin θ ≤ 1.

2. sin 90° = 1

கணக்கீடு:

sinθ − 3 sin θ + 2 = 0

⇒ sinθ − 2 sin θ - sin θ + 2 = 0

⇒ sin θ(sin θ - 2) - 1(sin θ - 2) = 0

⇒ (sin θ - 2) (sin θ - 1) = 0

So, sin θ = 1 (∵ sin θ ≠ 2)

⇒ sin θ = sin 90°

⇒ θ = 90°

∴ θ இன் மதிப்பு 90° ஆகும்.

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