mysql> select tan(pi()/4);+--------------------+| tan(pi()/4) |+--------------------+| 0.9999999999999999 |+--------------------+1 row in set (0.00 sec)
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mysql> select tan(pi()/4);+--------------------+| tan(pi()/4) |+--------------------+| 0.9999999999999999 |+--------------------+1 row in set (0.00 sec)
转载于:https://www.cnblogs.com/sea-stream/p/11299832.html