高中三角函数所有公式

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  • 你可以到这里

    诱导公式(口诀:奇变偶不变,符号看象限.)

    sin(-α)=-sinα

    cos(-α)=cosα tan(-α)=-tanα

    cot(-α)=-cotα

    sin(π/2-α)=cosα

    cos(π/2-α)=sinα

    tan(π/2-α)=cotα

    cot(π/2-α)=tanα

    sin(π/2+α)=cosα

    cos(π/2+α)=-sinα

    tan(π/2+α)=-cotα

    cot(π/2+α)=-tanα

    sin(π-α)=sinα

    cos(π-α)=-cosα

    tan(π-α)=-tanα

    cot(π-α)=-cotα

    sin(π+α)=-sinα

    cos(π+α)=-cosα

    tan(π+α)=tanα

    cot(π+α)=cotα

    sin(3π/2-α)=-cosα

    cos(3π/2-α)=-sinα

    tan(3π/2-α)=cotα

    cot(3π/2-α)=tanα

    sin(3π/2+α)=-cosα

    cos(3π/2+α)=sinα

    tan(3π/2+α)=-cotα

    cot(3π/2+α)=-tanα

    sin(2π-α)=-sinα

    cos(2π-α)=cosα

    tan(2π-α)=-tanα

    cot(2π-α)=-cotα

    sin(2kπ+α)=sinα

    cos(2kπ+α)=cosα

    tan(2kπ+α)=tanα

    cot(2kπ+α)=cotα

    (其中k∈Z)