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AP EAMCET · Maths · Indefinite Integration

If f(x)=cosec5xdx, then fπ4=

  1. A -14[32-5log(2+1)]+c
  2. B -18[52-3log(2+1)]+c
  3. C -18[72+3log(2+1)]+c
  4. D 18[52+log(2+1)]+c
Verified Solution

Answer & Solution

Correct Answer

(C) -18[72+3log(2+1)]+c

Step-by-step Solution

Detailed explanation

Given: fx=∫cosec5x dx =∫cosec3xIcosec2xIIdx =cosec3x-cotx-∫-3cosec3xcotx-cotxdx =-cosec3xcotx-∫3cosec3xcot2xdx =-cosec3xcotx-∫3cosec3xcosec2x-1dx =-cosec3xcotx-3∫cosec5xdx+3∫cosec3xdx =-cosec3xcotx-3fx+3∫cosec3xdx…