cos(-17/4派)-sin(-17/4派)的值是？
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cos(-17π/4)-sin(-17π/4)
=cos17π/4+sin17π/4
=cos(4π+π/4)+sin(4π+π/4)
=cosπ/4+sinπ/4
=根2
=cos17π/4+sin17π/4
=cos(4π+π/4)+sin(4π+π/4)
=cosπ/4+sinπ/4
=根2
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