View Compilation Error

0_0_2754342_17678.cpp: In function `bool operator==(const Point&, const Point&)':
0_0_2754342_17678.cpp:32: error: `fabs' undeclared (first use this function)
0_0_2754342_17678.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2754342_17678.cpp: In function `Point Test(double, Vector, Point, int, int)':
0_0_2754342_17678.cpp:50: error: `cos' undeclared (first use this function)
0_0_2754342_17678.cpp:50: error: `sin' undeclared (first use this function)
0_0_2754342_17678.cpp: In function `int main()':
0_0_2754342_17678.cpp:102: error: `cos' undeclared (first use this function)
0_0_2754342_17678.cpp:102: error: `sin' undeclared (first use this function)
0_0_2754342_17678.cpp:142: error: `sqrt' undeclared (first use this function)