cos(3π-α)怎么化简
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cos(3π-α)怎么化简cos(3π-α)怎么化简cos(3π-α)怎么化简cos(2π+π-α)=cons(π-α)=-cosα三角函数的基本公式还要加强记忆,=COS(pi-a)=-cos(a)
cos(3π-α)怎么化简
cos(3π-α)怎么化简
cos(3π-α)怎么化简
cos(2π+π-α)=cons(π-α)=-cosα
三角函数的基本公式还要加强记忆,
=COS(pi-a)=-cos(a)
cos(π-α)=-cosα
=-cosa
-cosα
cos(3π-α)
=cos(3π-α-2π)
=cos(π-α)
=-cosα
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