0_0_31713071_5165.cpp: In function 'int main()':
0_0_31713071_5165.cpp:10:22: error: 'atan' was not declared in this scope
v=1/tan(atan(1/s)-atan(1/u));
^
0_0_31713071_5165.cpp:10:33: error: 'tan' was not declared in this scope
v=1/tan(atan(1/s)-atan(1/u));
^
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