c ^ { 2 } = ( a - b ) ^ { 2 } \operatorname { cos } ^ { 2 } \frac { C – InterviewSolution

1.	c ^ { 2 } = ( a - b ) ^ { 2 } \operatorname { cos } ^ { 2 } \frac { C } { 2 } + ( a + b ) ^ { 2 } \operatorname { sin } ^ { 2 } \frac { C } { 2 }
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