View Compilation Error

0_0_9376057_3856.cpp: In function `int main()':
0_0_9376057_3856.cpp:18: error: `acos' undeclared (first use this function)
0_0_9376057_3856.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9376057_3856.cpp:33: error: `sin' undeclared (first use this function)
0_0_9376057_3856.cpp:34: error: `cos' undeclared (first use this function)
0_0_9376057_3856.cpp:35: error: `sqrt' undeclared (first use this function)