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TS EAMCET · Maths · Indefinite Integration

If 1+cos8xtan2x-cot2xdx=fx·cosgx+c, then f14+g14=

  1. A 2
  2. B 178
  3. C 158
  4. D 3316
Verified Solution

Answer & Solution

Correct Answer

(D) 3316

Step-by-step Solution

Detailed explanation

∫1+cos8xtan2x-cot2xdx=∫2cos24xsin2xcos2x-cos2xsin2xdx =∫2cos24xsin2xcos2xsin22x-cos22xdx=-∫cos24xsin4xcos4xdx =-12∫2cos4xsin4xdx=-12∫sin8xdx =12cos8x8+c i.e. fx=116, gx=8x Hence, f14+g14=116+2=3316