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a)
cos²α=1-(4/5)²
cos²α=1-16/25=9/25
cosα=-3/5
tgα=4/5:(-3/5)=-4/3
b)
sin²α=1-(-12/13)²
sin²α=1-144/169=25/169
sinα=5/13
tgα=5/13:(-12/13)
tgα=-5/12