RT
arctan 1 =?
反正切是反正切函数。
以来
棕褐色π/ 4 =棕褐色45º= 1
1的反正切等于1的反正切函数,等于π/ 4弧度或45度:
arctan 1 = tan -1 1 =π/ 4 rad =45º
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