Вычислите:
(sin 125/sin 55)-(cos 125/cos55)
(sin(90+35)sin(90-35))-(cos(90+35)cos(90-35))=cos35cos35-sin35cin35=cos(35+35)=cos70
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(sin(90+35)sin(90-35))-(cos(90+35)cos(90-35))=cos35cos35-sin35cin35=cos(35+35)=cos70