JEE Main · 2021 · 17 Mar 2021 · Shift 1 · Inverse Trigonometric Functions

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If upto terms, then is:
  1. (A)
  2. (B)
  3. (C)
  4. (D)✓ Correct

Answer: (D)

Solution

The terms are , that is , so the th term is . Since

the sum from to telescopes to . Hence

so and .

JEE Main · 2021 · 17 Mar 2021 · Shift 1 · Single correct option

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