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TS EAMCET · Maths · Indefinite Integration

If excosxdx=ex2cosx+sinx and coslog2x+33-2x3-2x2dx=fx24cosgx+singx+c then g1=

  1. A 5
  2. B logf2
  3. C logf1
  4. D 0
Verified Solution

Answer & Solution

Correct Answer

(C) logf1

Step-by-step Solution

Detailed explanation

I=∫coslog2x+33-2x3-2x2dx Let log2x+33-2x=t⇒2x+33-2x=et i.e. 3-2x2-2x+3-23-2x2dx=etdt ⇒13-2x2dx=112etdt So, I=124∫etcostdt =et24cost+sint=2x+33-2x24coslog2x+33-2x+sinlog2x+33-2x i.e. gx=log2x+33-2x, fx=2x+33-2x ⇒gx=logfx Hence, g1=logf1