三角函數(shù)恒等式-全文預覽
【正文】 π/2+α）= cosα cos（3π/2+α）= sinα tan（3π/2+α）= cotα cot（3π/2+α）= tanα sin（3π/2α）= cosα cos（3π/2α）= sinα tan（3π/2α）= cotα cot（3π/2α）= tanα (以上k∈Z) A a)tan(60176。a)[cos(60176。(60176。)/2]sin[(a30176。)(cosacos30176。a)/2] =4sinasin(60176。+sina)(sin60176。cos(π/3+α)cos(π/3α) tan3a = tan a sin(π/3+α)sin(π/3α) cos3α=4cosαsin^2a) =4sina(sin60176。a)/2]cos[(60176。) =4cosa(cosa+cos30176。)/2]*{2sin[(a+30176。) =4cosasin[90176。+a)] =4cosacos(60176。+a) 上述兩式相比可得 tan3a=tanatan(60176。α及3π/2177。 +2ABcos(θφ)} } √表示根號,包括{……}中的內(nèi)容 誘導公式 sin(α) = sinα cos(α) = cosα tan (α)=tanα sin(π/2α) = cosα cos(π/2α) = sinα sin(π/2+α) = cosα cos(π/2+α) = sinα sin(πα) = sinα cos(πα) = cosα sin(π+α) = si
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