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cos = b/c
b = 12
c = 13
a²+12² = 13²
a² = 169-144
a² = 25
a = 5
sin = 5/13
cosα=12/13
z 1 trygonometrycznej policzymy sinα
sin²α+cos²α=1
sin²α+(12/13)²=1
sin²α+144/169=1
sin²α=-144/169+1
sin²α=25/169
sinα=√25/169
sinα=5/13