sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
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sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)sin(540-α)/tan(α-180)*cot(-α-360)
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
原式=sin(180º-α)/tan(180º+α)]·cot(-α)]/tan(180º-α)·cos(-α)/sin(-α)
=sinα/tanα·(-cotα)/(-tanα)·cosα/(-sinα)
=sinα·(cosα/sinα)·cot²α·(-cotα)
=-cosα·cot³α
-cotα*cotα*cotα
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
=sin(180º-α)/tan(180º+α)]·cot(-α)]/tan(180º-α)·cos(-α)/sin(-α)
=sinα/tanα·(-cotα)/(-tanα)·cosα/(-sinα)
=sinα·(cosα/sinα)·cot²α·(-cotα)
=-cosα·cot³α
sinα>tanα
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
化简：sin^(-α)-tan(360-α)tan(-α)-sin(180-α)cos(360-α)tan(180+α)
若sinαtanα
若sinα*tanα
证明三角恒等式tanαsinα/(tanα-sinα)=(tanα+sinα)/tanαsinα
证明:(tanα*sinα)/(tanα-sinα)=(tanα+sinα)/(tanα*sinα)
证明:(tanα*sinα)/(tanα-sinα)=(tanα+sinα)/(tanα*sinα)
求证(tanα·sinα)/(tanα-sinα)=(tanα+sinα)/(tanα·sinα)
求证(tanαsinα)/(tanα-sinα)=(tanα+sinα)/(tanαsinα)
求证:(tanα+tanβ)/(tanα-tanβ)=sin(α+β)/sin(α-β)
.[1/cos(-α)+cos(180°+ α )]/[1/sin(540°-α)+sin(360°-α)]=tan^3α
若a属于(0,π/2)试比较tanα、tan(tanα)、tan(sinα)
化简：tanα(cosα-sinα)+sinα(sinα+tanα)/1+cosα.
证明恒等式tanαsinα/tanα-sinα=1+cosα/sinα
求证：tan α=(sin α)/(sin α)求证：tan α=(sin α)/(cos α)
cosα·tanα-Sinα