If A + B = 90° and sin A = \(\frac{3}{5}\), then the value of tan B is __________.

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SSC CGL 2023 Tier-I Official Paper (Held On: 27 Jul 2023 Shift 1)
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  1. \(\frac{4}{3}\)
  2. \(\frac{5}{4}\)
  3. \(\frac{3}{4}\)
  4. \(\frac{5}{3}\)

Answer (Detailed Solution Below)

Option 1 : \(\frac{4}{3}\)
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Detailed Solution

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Given:-

A + B = 90° 

SinA = 3/5

Formula Used:- 

Hypotenuse2 = Perpendicular2 + Base2

Sinθ = Perpendicular(P)/Hypotenuse(H)

tanθ = Perpendicular/Base(B)

tan(90° - A) =  cotA

Calculation:-

SinA = 3/5 = P/H

⇒ P = 3k and H = 5k   [Where k is a constant]

Base = √(H2 - P2)

⇒ Base = √(5k)2 - (3k)2

⇒ Base = 4k

tanA = P/B

⇒ tanA = 3k/4k = 3/4  

⇒ tan(90° - B) = 3/4

⇒ cotB = 3/4

⇒ tanB = 4/3

∴ The required answer is tanB = 4/3.
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