cos(45°— 30°)等于多少

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cos(45°—30°)等于多少cos(45°—30°)等于多少cos(45°—30°)等于多少cos(45°—30°)=cos(45)cos(30)+sin(45)sin(30)=(√6+√2)/4

cos(45°— 30°)等于多少
cos(45°— 30°)等于多少

cos(45°— 30°)等于多少
cos(45°— 30°)
=cos(45)cos(30)+sin(45)sin(30)
=(√6+√2)/4