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tan(-11π/4﹚-cos﹙-11π/4﹚的符号?
人气:303 ℃ 时间:2020-06-27 00:23:32
解答
tan (-11π/4) - cos(-11π/4)
=tan (π/4) + cos(π/4)
=1+√2/2 >0
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