4 \left( \cos ^ { 3 } 10 + \sin ^ { 3 } 20 ^ { \circ } \right) = 3 \le – InterviewSolution

1.	4 \left( \cos ^ { 3 } 10 + \sin ^ { 3 } 20 ^ { \circ } \right) = 3 \left( \cos 10 ^ { \circ } + \sin 20 ^ { \circ } \right)
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