Алгебра. Тригонометрия.. Created by sashenka151. algebra-ru

Алгебра. Тригонометрия...

June 2022 1 6 Report

Алгебра. Тригонометрия.

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Vas61 Sin(α-β)=sinαcosβ-sinβcosα
cos²β=1-sin²β=1-(-4/5)²=9/25 β∈3четверти, cosβ<0 cosβ=-3/5
cos²α=1-sin²α=1-9/25=16/25 α∈2четверти cosα<0 cosα=-4/5
sin(α-β)=3/5×(-3/5)-(-4/5)×(-4/5)=-9/25-16/25=-1

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