sin (a + b) = 1 మరియు cos (a - b) = \(\frac{1}{2} \) అయితే, a విలువను కనుగొనండి.

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SSC CGL 2023 Tier-I Official Paper (Held On: 14 Jul 2023 Shift 1)
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  1. 75°
  2. 30°
  3. 15°
  4. 45°

Answer (Detailed Solution Below)

Option 1 : 75°
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ఇచ్చినవి:

sin(A + B) = 1 మరియు cos(A - B) = 1/2

ఉపయోగించిన సూత్రాలు:

sin90° = 1

cos60° = 1/2

గణన:

sin(A + B) = 1

⇒ sin(A + B) = sin90°

⇒ A + B = 90° ....(1)

మళ్ళీ,

cos(A - B) = 1/2

⇒ cos(A - B) = cos60°

⇒ A - B = 60° .....(2)

సమీకరణం (1) మరియు (2) లను కలిపితే,

⇒ A + B + A - B = (90° + 60°)

⇒ 2A = 150°

⇒ A = (150/2)

⇒ A = 75°

a విలువ 75°.

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