1)[tex]cos \frac{3 \pi }{4}=[/tex]
2)[tex]sin \alpha ,[/tex] если [tex]cos \alpha = -\frac{12}{13} ,[/tex] и [tex] \pi < \alpha < \frac{3}{2} \pi [/tex]
3)[tex] cos \alpha,cos( \frac{ \pi }{3}- \alpha ) ,[/tex] если [tex]sin \alpha =0.6 [/tex] и [tex] \pi < \alpha < \frac{3}{2} \pi [/tex]
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