cos∧2(75º)+cos∧2(15º)+cos(75º)cos(15º)的值
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cos∧2(75º)+cos∧2(15º)+cos(75º)cos(15º)的值
cos∧2(75º)+cos∧2(15º)+cos(75º)cos(15º)的值
cos∧2(75º)+cos∧2(15º)+cos(75º)cos(15º)的值