化简 {sin(60+α )+cos120sinα}/cosα

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化简 {sin(60+α )+cos120sinα}/cosα

化简 {sin(60+α )+cos120sinα}/cosα
化简 {sin(60+α )+cos120sinα}/cosα

化简 {sin(60+α )+cos120sinα}/cosα
{sin(60+α )+cos120sinα}/cosα
={sin60cosα+cos60sina+cos120sinα}/cosα
=√3/2+{1/2sina-1/2sina}/cosa
=√3/2