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TS EAMCET · Maths · Indefinite Integration

If In=xnsinxdx and I6-360I2=fxcosx+gxsinx, then f1+g1=

  1. A -85
  2. B 0
  3. C -53
  4. D 75
Verified Solution

Answer & Solution

Correct Answer

(A) -85

Step-by-step Solution

Detailed explanation

I6=∫x6sinxdx =−x6cosx+∫6x5cosxdx =−x6cosx+6(x5sinx−∫5x4sinxdx) I6+30I4=−x6cosx+6x5sinx ∴I4+12I2=−x4cosx+4x3sinx ∴I6−360I2= (30x4−x6)cosx+(−120x3+6x5)sinx ∴f(1)+f(1)=29−114=−85