Доказать, что если [tex]a+b+y= \pi [/tex]
То справедливо равенство:
[tex]sina+sinb+siny=4cos \frac{a}{2} *cos \frac{b}{2} *cos \frac{y}{2} [/tex]

2) [tex]sin2a+sin2b+sin2y=4sina*sinb*siny[/tex]
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