Определите знак выражения
cos[tex]\frac{5\pi }{7}[/tex] + cos[tex]\frac{3\pi }{4}[/tex]
cos[tex]\frac{5\pi }{7}[/tex] + cos[tex]\frac{3\pi }{4}[/tex]
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Answers & Comments
cos(π-2π/7)+cos(π-π/4)=-cos(2π/7)-cos(π/4)=
-(cos2π/7+cosπ/4)<0
(cos(2π/7)>0;cos(π/4)>0)
(cos5π/7+cos3π/4)<0