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sin(3兀/4)等于多少???

解:因为 --派/4<a<3派/4, 所以 --3派/4

√2/2解析:sin(3π/4)=sin(π-3π/4)=sin(π/4)=√2/2

sin(-3π/4) =-sinπ/4=-根号2/2

Sin4分之3π =sin(π-π/4) =sin(π/4) =√2/2 =2分之根号2

sin(4π/3)=sin[π+(π/3)]=-sin(π/3)=-√3/2

没错

答案如图

(1)偶函数,所以ψ=π/2,相邻两条对称轴之间距离为π,所以周期为2π,所以ω=1。 F(x)=c

arcsin的值域是[-π/2,π/2] 所以 arcsin(sin3π/4) =arcs

解: 用诱导公式一个个简化, tan(π/4+α)=cot(π/4-α)=cos(π/4-α)/

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