cos225+tan240+sin(-60)

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cos225+tan240+sin(-60)
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cos225+tan240+sin(-60)
cos225+tan240+sin(-60)

cos225+tan240+sin(-60)
cos225+tan240+sin(-60)
=-cos45+tan60-sin60
=-√2/2+√3-√3/2
=-√2/2+√3/2

cos225+tan240+sin(-60)
=-cos45+tan60-sin60
接下去应该会了吧

cos225+tan240+sin(-60)
=cos(180+45)+tan(180+60)+sin(-60)
=-cos45+tan60-sin60
=-√2/2+√3-1/2
上面那个是更号,算一下就OK了