设x为锐角,cos(x+π除以6)=五分之四,则sin(2x+π除以12)
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设x为锐角,cos(x+π除以6)=五分之四,则sin(2x+π除以12)
设x为锐角,cos(x+π除以6)=五分之四,则sin(2x+π除以12)
设x为锐角,cos(x+π除以6)=五分之四,则sin(2x+π除以12)
设x为锐角,cos(x+π除以6)=五分之四=4/5,
∵4/5>√2/2,cos(π除以4)=√2/2
∴0