View Compilation Error

981908_0_0_12589.cpp: In function `int main()':
981908_0_0_12589.cpp:9: error: `sin' undeclared (first use this function)
981908_0_0_12589.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
981908_0_0_12589.cpp:10: error: `cos' undeclared (first use this function)
981908_0_0_12589.cpp:11: error: `sqrt' undeclared (first use this function)