1)sin(x+y)-cosxsiny 2)cos(x-y)-sinxsiny 3)sina cosb_sin(a-b)

Question

Алгебра: 1)sin(x+y)-cosxsiny 2)cos(x-y)-sinxsiny 3)sina cosb_sin(a-b)

Lidyanka · Answer

1)sin(x+y)-cosxsiny=sinxcosy+sinycosx-cosxsiny=sinxcosy2)cos(x-y)-sinxsiny=cosxcosy+sinxsiny-sinxsiny=cosxcosy3)sinacosb-sin(a-b)=sinacosb-(sinacosb-sinbcosa)=sinacosb-sinacosb+sinbcosa=sinbcosa...

1)sin(x+y)-cosxsiny 2)cos(x-y)-sinxsiny 3)sina cosb_sin(a-b)

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