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sinα/cosα = -4/3 /*cosα
sinα =-4/3cosα /:()²
sin²α = 16/9cos²α
korzystam ze wzoru na jedynkę trygonometryczną
sin²α + cos²α = 1
16/9cos²α + cos²α = 1
25/9cos²α = 1 /* 9/25
cos²α = 9/25 /√
cosα = 3/5
sinα = -4/3cosα
sinα = -4/3 * 3/5
sinα = -4/5
zatem
sinα*cosα = 3/5 * -4/5 = -12/25