Integrals

If 01 1 3+x+ 1+x dx=a+b 2+c 3, where a, b, c are rational numbers, then 2a+3b-4c is equal to :

1. 10
2. 7
3. 4
4. 8

If (a, b) be the orthocentre of the triangle whose vertices are (1,2),(2,3) and (3,1), and I1= ab x (4x-x2 )dx, I2= ab (4x-x2 )dx, then 36 I1I2 is equal to :

1. 80
2. 72
3. 66
4. 88

The integral (x8-x2 )dx (x12+3x6+1 ) -1 (x3+ 1x3 ) is equal to :

1. e ( | -1 (x3+ 1x3 ) | )1/3+C
2. e ( | -1 (x3+ 1x3 ) | )+C
3. e ( | -1 (x3+ 1x3 ) | )1/2+C
4. e ( | -1 (x3+ 1x3 ) | )3+C

For 0<a<1, the value of the integral 0 dx1-2a x+a2 is :

1. 2 +a2
2. 2 -a2
3. 1-a2
4. 1+a2

Let f(x)= 0x g(t) e ( 1-t1+t )dt, where g is a continuous odd function. If - /2 /2 (f(x)+ x2 x1+ex )dx= ( )2- , then is equal to .