sin(a-15)=1/3,则cos(30-2a)的值sin(a-15)=1/3,则cos(30-2a)的值?

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sin(a-15)=1/3,则cos(30-2a)的值sin(a-15)=1/3,则cos(30-2a)的值?

sin(a-15)=1/3,则cos(30-2a)的值sin(a-15)=1/3,则cos(30-2a)的值?
sin(a-15)=1/3,则cos(30-2a)的值
sin(a-15)=1/3,则cos(30-2a)的值?

sin(a-15)=1/3,则cos(30-2a)的值sin(a-15)=1/3,则cos(30-2a)的值?

是这样子吗?