\(\frac{{\sin 30^\circ }}{{1 + \;cos30^\circ }} + \frac{{1 + {\rm{\;cos}}30^\circ }}{{sin30^\circ }} = \;?\)

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RRB ALP Previous Paper 11 (Held On: 17 Aug 2018 Shift 1)
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  1. 3
  2. 1
  3. 2
  4. 4

Answer (Detailed Solution Below)

Option 4 : 4
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Detailed Solution

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\(\frac{{\sin 30^\circ }}{{1 + \;cos30^\circ }} + \frac{{1 + {\rm{\;cos}}30^\circ }}{{sin30^\circ }} = \;?\)

⇒ ? = (1/2) / (1 + √3/2) + (1 + √3/2) / (1/2)

⇒ ? = 1/(2 + √3)  +  (2 + √3)

⇒ ? = (1 + (2 + √3)2) / (2 + √3)

⇒ ? = (1 + 4 + 3 + 4√3) / (2 + √3)

⇒ ? = (8 + 4√3) / (2  + √3)

⇒ ? = 4(2 + √3) / (2  + √3)

⇒ ? = 4

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