TS EAMCET · Maths · Trigonometric Ratios & Identities
Let be a triangle with right-angle at Let units, units and Then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
△ACB is a right triangle, right angled at C. Therefore, by using Pythagoras theorem we get, AB2=AC2+BC2 AC2=AB2-BC2 AC2=292-212 AC2=400 AC=20 units cos θ=BCAB=2129 sin θ=ACAB=2029 ⇒cos2θ-sin2θ=21292-20292=41841
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