求值并比较sin(-54π/7)与sin(-63π/8)的大小

问题描述:

求值并比较sin(-54π/7)与sin(-63π/8)的大小

sin(-54π/7)【大于】sin(-63π/8)
sin(-54π/7)=sin(2π/7);sin(-63π/8)=sin(π/8)
因为:0怎么计算sin(-54π/7)=sin[(-54π/7)+8π]=sin(2π/7)sin(-63π/8)=sin[(-63π/8)+8π]=sin(π/8)而:0sin(π/8)即:sin(-54π/7)>sin(-63π/8)