Ответы на вопрос:
Sin 13π/4 = sin(2π+ 5π/4) = sin 5π/4 = -1/√2
cos405°=cos (360+45)=cos45°=π/4=√2/2
tg(-11π/6)=-tg(11π/6)=-tg(2π-π/6)=-tg(-π/6)=tgπ/6=√3/3
ctg 5π/4 = ctg (π+π/4 )= ctg π/4 = 1Популярно: Математика
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