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AP EAMCET · Maths · Indefinite Integration

If 1+tanxsin2xdx=Alogtanx+Btanx+C then 4A-B=

  1. A -1
  2. B 2
  3. C 1
  4. D -2
Verified Solution

Answer & Solution

Correct Answer

(C) 1

Step-by-step Solution

Detailed explanation

I=∫1+tanxsin2xdx=∫1sin2x+tanxsin2xdx =∫12sinxcosxdx+∫sinx2sinxcosxcosxdx =∫12sinxcosxcos2xdx+∫12sinxcosxcos2xdx =∫sec2x2tanxdx+∫sec2x2tanxdx =12lntanx+tanx+C So, 4A-B=4×12-1=1