First slide
Methods of integration
Question

For real numbers α,β,γ and δ , if x21+tan1x2+1xx4+3x2+1tan1x2+1xdx=αlogetan1x2+1x+βtan1γx21x+δtan1x2+1x+C

where C is an arbitrary constant, then the value of 10α+βγ+δ is equal to _____

Difficult
Solution

G.E.=I=x2-1dxx4+3x2+1tan-1x2+1x+dxx4+3x2+1I=x21-1x2dxx2x2+3+1x2tan-1x2+1x+dxx2x2+3+1x2,Now, I1=1-1x2dxx+1x2+1tan-1x+1x, Take tan-1x+1x=θ, x+1x=tanθ,     1-1x2 dx=sec2θdθ

            =sec2θdθ1+tan2θθ=logθ=logtan-1x+1x and  I2=121+1x2-1-1x2x2+3+1x2dx           =121+1x2dxx-1x2+5-121-1x2dxx+1x2+1           =1215tan-1x-1x5-12tan-1x+1x1

I=logtan-1x+1x+1215tan-1x-1x5-12tan-1x+1x1      =logtan-1x+1x+1215tan-115x2-1x-12tan-1x2+1xComparing, we get α=1,β=125,γ=15,δ=-12 10(α+βγ+δ)=101+110-12=10+1-5=6

 

Get Instant Solutions
When in doubt download our app. Now available Google Play Store- Doubts App
Download Now
Doubts App