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AP EAMCET · Maths · Indefinite Integration

If the primitive of cos(logx) is f(x){cos(g(x))+sin(h(x))}, then which among the following is true?

  1. A h'(x)=-1x
  2. B f'(x)=12
  3. C g'(x)=log(x)
  4. D h(x)=x2
Verified Solution

Answer & Solution

Correct Answer

(B) f'(x)=12

Step-by-step Solution

Detailed explanation

Primitive means integration ⇒∫coslogxdx=fxcosgx+sinhx ⇒I=∫coslogxdx By parts formula ∫u·v dx=u∫v dx-∫ddxu∫vdxdx ⇒I=∫1.coslogxdx ⇒I=coslogx·x-∫-sinlogxxx dx…
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