Ответы на вопрос:
Cos(a) = v(1 - (12/13)^2 ) = v(13^2 - 12^2) /13 = 5/13, sin(b) = v(1 - (3/5)^2) = v(5^2 - 3^2) /5 = v(2*8) /5 = 4/5, tg(a+b) = sin(a+b)/cos(a+b) = = ( sin(a)*cos(b) + sin(b)*cos(a) )/( cos(a)*cos(b) - sin(a)*sin(b) ) = = ( (12/13)*(3/5) + (4/5)*(5/13) )/( (5/13)*(3/5) - (12/13)*(4/5) ) = = ( 12*3 + 4*5 )/( 5*3 - 12*4) = (36+20)/(15 - 48) = 56/(-33) = -56/33.
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