TS EAMCET · Maths · Trigonometric Ratios & Identities
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
cot215°-1cot215°+1 =cos215°sin215°-1cos215°sin215°+1 (Using cotx=cosxsinx) =cos215°-sin215°cos215°+sin215° =cos2×15°1 (Using cos2x-sin2x=cos2x & cos2x+sin2x=1) =32
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