If  = 10 and  = 11, then the value of cos2β is:

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SSC CGL 2023 Tier-I Official Paper (Held On: 21 Jul 2023 Shift 3)
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Answer (Detailed Solution Below)

Option 2 :
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PYST 1: SSC CGL - General Awareness (Held On : 20 April 2022 Shift 2)
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Detailed Solution

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Given:

 = 10 ,  = 11

Calculation:

10 sinβ = 11 cosβ

⇒ tanβ = 11/10

cos2β = 100/221

The correct option 2

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