0_0_6865402_6382.cpp:13: error: `acos' was not declared in this scope
0_0_6865402_6382.cpp: In function `void solved(int)':
0_0_6865402_6382.cpp:22: error: `sqrt' undeclared (first use this function)
0_0_6865402_6382.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)
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