sqrt (9-{x)^2}+C

2、已知 (x)=sqrt (9-{x)^2}, 则f[f(t)]为 ()-|||-(A) sqrt (9-sqrt {9-{t)^2}}; (B)t; (C)

∫(;)_(0)^3sqrt(9-(x)^2)dx= ____ ．∫${\;}_{0}^{3}$$\sqrt{9-{x}^{2}}$dx= ____ ．

(int )_(-3)^3sqrt (9-{x)^2}dx= ． ．

2.函数 =dfrac (sqrt {9-{x)^2}}(ln (x+1)) 的定义域 ()-|||-

函数y=(1)/((x)^2-1)-sqrt(9-(x)^2)的定义域是（ ）A. [-3，3]B. [-3，-1）C. [-3，-1）∪（-1，1）∪（1，3

定积分int_0^3(sqrt(9-{x^2))}dx的值为 ____ ．定积分$\int_0^3$${\sqrt{9-{x^2}}}$dx的值为 ____ ．

求定积分 (int )_(0)^3dfrac (dx)(x+sqrt {9-{x)^2}} 的值.

sqrt [3](27)= ()-|||-A 8-|||-B 1-|||-C 9-|||-D 3

[题目]利用定积分的几何意义,求 (int )_(-3)^3sqrt (9-{x)^2}dx.

(2) int dfrac (sqrt {{x)^2-9}}(x)dx