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If not stretchy integral fraction numerator sin invisible function application x over denominator sin invisible function application left parenthesis x minus alpha right parenthesis end fractiondx = Ax + B log sin (x – ) + c then value of (A, B) is

  1. (– sin alpha, cos alpha)    
  2. (cos alpha, sin alpha)    
  3. (sin alpha, cos alpha)    
  4. (– cos alpha, sin alpha)    

The correct answer is: (cos alpha, sin alpha)


    not stretchy integral fraction numerator sin invisible function application left parenthesis x minus alpha plus alpha right parenthesis over denominator sin invisible function application left parenthesis x minus alpha right parenthesis end fractiondx
    = not stretchy integral fraction numerator sin invisible function application left parenthesis x minus alpha right parenthesis cos invisible function application alpha plus cos invisible function application left parenthesis x minus alpha right parenthesis sin invisible function application alpha over denominator sin invisible function application left parenthesis x minus alpha right parenthesis end fractiondx
    = cos not stretchy integral d x plus sin invisible function application alpha not stretchy integral cot invisible function application left parenthesis x minus alpha right parenthesis d x
    = (cos ) x + sin . log {sin (x – )} + c

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