求sin π/12-(根号3)cos π/12
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求sin π/12-(根号3)cos π/12
cosπ/12+(根号3)×sinπ/12的值
根号3×cosπ/12-sinπ/12=?
sinπ/12-根号3cosπ/12的值
根号3sinπ/12+cosπ/12
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若sin(3π-α)=(根号2)sin(2π+β),(根号3)cos(-α)=(-根号2)cos(π+β),且0<α<π,0<β<π,求sinα,sinβ的值
cos(π/3-α)=1/8,则cosα+(根号3)sinα的值为____已知cosα-cosβ=1/2,sinα-sinβ=1/3,求cos(α+β)的值
sin π/12 -根号3cos π/12的值为:-根号2?为什么.
cos(π/6+a)=根号3/3 求sin(5π/6-a)=?
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根号3sin(π/6-a)-cos(π/6-a)
cosπ/6+根号3sinπ/6=?
已知sin(π-α)-cos(π+α)=根号2分之4,求sin(π+α)+cos(3π-α)的值