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AP EAMCET · Maths · Indefinite Integration

If In=tannxdx, and I0+I1+2I2+2I3+2I4+I5+I6=K=1ntanKxK, then n=

  1. A 6
  2. B 5
  3. C 4
  4. D 3
Verified Solution

Answer & Solution

Correct Answer

(B) 5

Step-by-step Solution

Detailed explanation

Reduction formulae for In=∫tannxdx=tann-1xn-1-In-2 i.e. In+In-2=tann-1xn-1 Given I0+I1+2I2+2I3+2I4+I5+I6=∑K=1ntanKxK Now, I0+I1+2I2+2I3+2I4+I5+I6=I2+I0+I3+I1+I4+I2+I5+I3+I6+I4 =tanx1+tan2x2+tan3x3+tan4x4+tan5x5 =∑K=15tanKxK Hence, n=5