sin（-26/6π）sin(-46/3π）-cos（-37/6π）tan（-55/6π）求值,
人气：237 ℃ 时间：2020-07-17 14:40:23
解答
sin（-26/6π）sin(-46/3π）-cos（-37/6π）tan（-55/6π）=sin（4π-26/6π）sin(16π-46/3π）-cos（6π-37/6π）tan（10π-55/6π）=sin（-1/3π）sin(2/3π）-cos（-1/6π）tan（5/6π）=-sin（1/3π）sin(π-1...
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