Q112 / 160 · AP EAMCET 2022 (04 Jul Shift 2) · Mathematics

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

  • A
    -1
  • B
    2
  • Correct answer
    C
    1
  • D
    -2

Solution

I=∫1+tanxsin2xdx=∫1sin2x+tanxsin2xdx

=∫12sinxcosxdx+∫sinx2sinxcosxcosxdx

=∫12sinxcosxcos2xdx+∫12sinxcosxcos2xdx

=∫sec2x2tanxdx+∫sec2x2tanxdx

=12lntanx+tanx+C

So, 4A-B=4×12-1=1

Hence, the correct answer is option: 'C'.

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