View Compilation Error

0_0_6923414_22333.cpp:14: error: `acos' was not declared in this scope
0_0_6923414_22333.cpp: In function `void solved(int)':
0_0_6923414_22333.cpp:27: error: `fabs' undeclared (first use this function)
0_0_6923414_22333.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6923414_22333.cpp:28: error: `sin' undeclared (first use this function)
0_0_6923414_22333.cpp:30: error: `cos' undeclared (first use this function)
0_0_6923414_22333.cpp:47: error: `tan' undeclared (first use this function)