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尤塞恩保特 念成汉语

sin : sāi yǐng (塞影) cos : kuō sāi yǐng (阔塞影) tan: tān tǐng (贪挺) cot: kuō tān tǐng (阔贪挺) 诱导公式: sin(-α) = -sinα cos(-α) = cosα tan (—a)=-tanα sin(π/2-α) = cosα cos(π/2-α) = sinα sin(π/2+α) = cosα cos(π/2+α) = -sinα ...

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