cos5π/12-tanπ/3sin5π/12的值是

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cos5π/12-tanπ/3sin5π/12的值是cos5π/12-tanπ/3sin5π/12的值是cos5π/12-tanπ/3sin5π/12的值是解cos5π/12-tanπ/3sin5π/

cos5π/12-tanπ/3sin5π/12的值是
cos5π/12-tanπ/3sin5π/12的值是

cos5π/12-tanπ/3sin5π/12的值是
解cos5π/12-tanπ/3sin5π/12
=cos75°-tan60°sin75°
=(√6-√2)/4-√3(√6+√2)/4
=(√6-√2)/4-(3√2+√6)/4
=[(√6-√2)-(3√2+√6)]/4
=-√2,
注意cos75°和sin75°也算常用三角函数值.