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Q. 185.0( 1 Vote )

Find :

Class 12th Mathematics - Board Papers Delhi-2015

Answer :

Let,

⇒ x+3 = A(-4-2x)+B

⇒ x+3 = -2Ax-4A+B

Equating the coefficient, we get

-2A=1 and -4A+B =3

⇒

⇒

∴

⇒

Let

And

⇒

Now ,

Let 3-4x-x²= t

⇒ -4-2x dx= -(4+2x)dx =dt

∴

Again ,

Thus,

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