যদি 1 + tan2θ = 4 এবং θ < 90° হয়, θ = ?
Solution
Correct Answer: Option C
1 + tan2θ = 4
⇒ sec2θ = 4 [sec2θ = 1 + tan2θ]
⇒ (secθ)2 = (2)2
⇒ secθ = 2
⇒ secθ= sec60°
⇒ 0=60°
⇒ sec2θ = 4 [sec2θ = 1 + tan2θ]
⇒ (secθ)2 = (2)2
⇒ secθ = 2
⇒ secθ= sec60°
⇒ 0=60°
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