cos(75°+α)=1/3 则cos(150°-α)等于几具体点答案为-1/3

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cos(75°+α)=1/3 则cos(150°-α)等于几具体点答案为-1/3
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cos(75°+α)=1/3 则cos(150°-α)等于几具体点答案为-1/3
cos(75°+α)=1/3 则cos(150°-α)等于几
具体点
答案为-1/3

cos(75°+α)=1/3 则cos(150°-α)等于几具体点答案为-1/3
cos(150°-α)=cos[180`-(75°+α)]=-cos(75°+α)=-1/3

[-(根2)-4]/6,[-(根2)+4]/6

cos(150°-α)=cos[180`-(75°+α)]=-cos(75°+α)=-1/3