高数中的三角函数sin(π/4+α)=多少 sin(π/4-α)=多少 cos(π/4+α)=多少 cos(π/4-α)
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高数中的三角函数
sin(π/4+α)=多少 sin(π/4-α)=多少 cos(π/4+α)=多少 cos(π/4-α)=多少 tan(π/4+α)=多少 tan(π/4-α)=多少
sin(π/4+α)=多少 sin(π/4-α)=多少 cos(π/4+α)=多少 cos(π/4-α)=多少 tan(π/4+α)=多少 tan(π/4-α)=多少
sin(π/4+α)=√2/2cosa+√2/2sina
sin(π/4-α)= √2/2cosa-√2/2sina
cos(π/4+α)=√2/2cosa-√2/2sina
cos(π/4-α)=√2/2cosa+√2/2sina
tan(π/4+α)=(1+tana)/(1-tana)
tan(π/4-α)=(1-tana)/(1+tana)
sin(π/4-α)= √2/2cosa-√2/2sina
cos(π/4+α)=√2/2cosa-√2/2sina
cos(π/4-α)=√2/2cosa+√2/2sina
tan(π/4+α)=(1+tana)/(1-tana)
tan(π/4-α)=(1-tana)/(1+tana)
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