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tg A(внешний) = -7/24
tg A= 7/24
1+tg^2 A = 1/ cos^2 A
1/ cos^2 A = 1+ 49/ 576= 625/ 576
cos^2 A =576/ 625
sin ^2 A =1- cos^2 A =1- 576/626 = 49/625
sin A= 7/ 25
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tg A(внешний) = -7/24
tg A= 7/24
1+tg^2 A = 1/ cos^2 A
1/ cos^2 A = 1+ 49/ 576= 625/ 576
cos^2 A =576/ 625
sin ^2 A =1- cos^2 A =1- 576/626 = 49/625
sin A= 7/ 25