Ответ:
a+b=180-y
sin((a+b)/2) = sin((180-y)/2)=sin(90-y/2)=cos(y/2)
Объяснение:
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Ответ:
a+b=180-y
sin((a+b)/2) = sin((180-y)/2)=sin(90-y/2)=cos(y/2)
Объяснение: