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三角函数的诱导公式表 函数 \[\sin\] \[\cos\] \[\tan\] \[-\alpha\] \[-\sin\alpha\] \[\cos\alpha\] \[-\tan\alpha\] \[\frac{\pi}{2}\pm\alpha\] \[\cos\alpha\] \[\mp\sin\alpha\] \[\mp\cot\alpha\] \[\pi\pm\alpha\] \[\mp\sin\alpha\] \[-\cos\alpha\] \[\pm\tan\alpha\] \[\frac{{3\pi }}{2}\pm\alpha\] \[-\cos\alpha\] \[\pm\sin\alpha\] \[\mp\cot\alpha\] \[2\pi\pm\alpha\] \[\pm\sin\alpha\] \[\cos\alpha\] \[\pm\tan\alpha\] \[n\pi\pm\alpha\] \[\pm\left({-1}\right)^n\sin\alpha\] \[\left({ - 1} \right)^n \cos\alpha\] \[\pm\tan\alpha\]