2
3
1
(
2)
x –
x +
15 4
1
1
x −
16 1
(
1)
n
x x +
 [Hint:  multiply numerator and denominator by x n – 1 and put xn = t ]
17 cos
(1– sin ) (2 – sin )
x
x
x
[Hint : Put sin x = t]
INTEGRALS         323
18