sin a = 3/5, sin(a)^2 + cos(a)^2 = 1, отсюда cos(a) = 4/5 либо -4/5, tg = sin(a)/cos(a), значит tg(a) = 3/4 либо -3/4
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sin a = 3/5, sin(a)^2 + cos(a)^2 = 1, отсюда cos(a) = 4/5 либо -4/5, tg = sin(a)/cos(a), значит tg(a) = 3/4 либо -3/4