Вычислите:
а) sin 9П/4[tex]sin\frac{9\pi}{4}[/tex]
б)[tex]cos (-\frac{4\pi}{3})[/tex]
в)[tex]tg(-\frac{7\pi}{6})[/tex]
Вычислите:
а) sin 9П/4[tex]sin\frac{9\pi}{4}[/tex]
б)[tex]cos (-\frac{4\pi}{3})[/tex]
в)[tex]tg(-\frac{7\pi}{6})[/tex]
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Verified answer
=tg(-7п/6+п)=tg(-П/6)=-tg(П/6)=-sqrt(3)
=cos(-П/3)=cos(П/3)=1/2
sin 9П/4=sin(П)/4sin(П/4)=0