ఇచ్చిన చిత్రంలో AD ⊥ BC, AC = 26 యూనిట్లు, CD = 10 యూనిట్లు, BC = 42 యూనిట్లు, ∠DAC = x మరియు ∠B = y అయితే \(\rm \frac{6}{\cos x}-\frac{5}{\cos y}+8\tan y\) విలువ ఎంత?

F5 SSC Arbaz 15-9-23 D1 v2

This question was previously asked in
SSC CGL 2023 Tier-I Official Paper (Held On: 17 Jul 2023 Shift 4)
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  1. \(\frac{16}{9}\) యూనిట్లు
  2. \(\frac{13}{6}\) యూనిట్లు
  3. \(\frac{25}{4}\) యూనిట్లు
  4. \(\frac{15}{7}\) యూనిట్లు

Answer (Detailed Solution Below)

Option 3 : \(\frac{25}{4}\) యూనిట్లు
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Detailed Solution

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ఇచ్చినది:

AD ⊥ BC; ∠D = 90°

AC = 26 యూనిట్లు; CD = 10 యూనిట్లు; BC = 42 యూనిట్లు

∠DAC = x మరియు ∠B = y

ఉపయోగించిన సూత్రం:

పైథాగరస్ సిద్ధాంతం:

H2 = P2 + B2

Cos θ = B/H ; tan θ = P/B

ఇక్కడ, H = హైపోటెన్యూస్(కర్ణం); P = లంబం; B = భూమి

గణన:

△DAC లో

⇒ AC2 = AD2 + CD2

262 = AD2 + 102

⇒ 676 = AD2 + 100

⇒ AD = √ (676 - 100) = 576 = 24 యూనిట్లు

△ADB లో

BD = (BC - CD) = (42 - 10) = 32 యూనిట్లు

⇒ AB2 = AD2 + BD2

⇒ AB2 = 242 + 322

⇒ AB2 = 576 + 1024

⇒ AB = √1600 = 40 యూనిట్లు

ప్రశ్న నుండి:

\(\rm \frac{6}{\cos x}-\frac{5}{\cos y}+8\tan y\)

⇒ 6/(AD/AC) - 5/(BD/AB) + 8 x (AD/BD)

⇒ 6/(24/26) - 5/(32/40) + 8 x (24/32)

⇒ (6 x 26/24) - (5 x 40/32) + 8 x ( 24/32 )

⇒ 6.5 - 6.25 + 6

⇒ 6.25 = 25/4 యూనిట్లు

∴ సరైన సమాధానం 25/4 యూనిట్లు.

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