Question
Download Solution PDFIf \(\frac{cos\,\alpha}{sin\,β}\) = 10 and \(\frac{cos\,\alpha}{cos\,β}\) = 11, then the value of cos2β is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
\(\frac{cos\,α}{sin\,β}\) = 10 , \(\frac{cos\,α}{cos\,β}\) = 11
Calculation:
10 sinβ = 11 cosβ
⇒ tanβ = 11/10
cos2β = 100/221
The correct option 2
Last updated on Jul 22, 2025
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