InterviewSolution
Saved Bookmarks
| 1. |
If tanθ = 3/4 then find the value of sin2(90° + θ) + tan2θ – cos2(90° + θ).1. 333/4002. 331/4003. 337/4004. 323/400 |
|
Answer» Correct Answer - Option 3 : 337/400 Given: tanθ = 3/4 Concept used: 1.) tanθ = P/B 2.) sinθ = P/H 3.) cosθ = B/H 4.) Pythagoras Theorem H2 = P2 + B2 5.) sin(90° + θ) = cosθ 6.) Cos(90° + θ) = -sinθ Where, P → Perpendicular B → Base H → Hypotenus Calculations: tanθ = 3/4 = P/B H2 = P2 + B2 ⇒ H2 = (3)2 + (4)2 ⇒ H = √25 = 5 sinθ = 3/5 cosθ = 4/5 sin2(90° + θ) + tan2θ – cos2(90° + θ) ⇒ cos2θ + tan2θ – (-sinθ)2 ⇒ cos2θ + tan2θ – sin2θ ⇒ (4/5)2 + (3/4)2 – (3/5)2 ⇒ 16/25 + 9/16 – 9/25 ⇒ (256 + 225 – 144)/400 ⇒ 337/400 ∴ The correct answer is 337/400 |
|