If cosec θ - cot θ = \(\frac{7}{2}\), then value of cos θ = ?
Answer & explanation
Correct answer: option 1
If cosec θ - cot θ = \(x\), then cosec θ + cot θ = \(\frac{1}{x}\)
ATQ,
⇒ cosec θ - cot θ = \(\frac{7}{2}\) ..........(i)
⇒ cosec θ + cot θ = \(\frac{2}{7}\) ..........(ii)
(i) + (ii)
⇒ 2 cosec θ = \(\frac{7}{2}\) + \(\frac{2}{7}\) = \(\frac{49 + 4}{14}\) = \(\frac{53}{14}\)
⇒ cosec θ= \(\frac{53 (H)}{28 (P)}\)
H2 = P2 + B2 ⇒ (53)2 = (28)2 + B2
⇒ B = 45
Hence,
cos θ = \(\frac{B}{H}\) = \(\frac{45}{53}\)