А) sin П/6 = 1/2, cos П/3 = 1/2, tg П/4 = 1, ctg П/2 = 0
sin П/6+cos П/3+tg П/4-ctg П/2 = 1/2 + 1/2 + 1 - 0 = 2
Б) sin^2(-П/6) = sin^2(П/6) = (1/2)^2 = 1/4, cos^2 П/4 = (1/√2)^2 = 1/2, tg(-П/3) = -tg(П/3) = -√3
sin^2(-П/6)-cos^2 П/4+tg(-П/3) = 1/4 - 1/2 - √3 = -1/4 - √3
В) cos(-П/2) = cos(П/2) = 0, cos(-П/4) = cos(П/4) = 1/√2, tg(-П/4) = -tg(П/4) = -1
cos(-П/2)cos(-П/4)tg(-П/4) = 0 (1/√2) (-1) = 0
А) sin П/6 = 1/2, cos П/3 = 1/2, tg П/4 = 1, ctg П/2 = 0
sin П/6+cos П/3+tg П/4-ctg П/2 = 1/2 + 1/2 + 1 - 0 = 2
Б) sin^2(-П/6) = sin^2(П/6) = (1/2)^2 = 1/4, cos^2 П/4 = (1/√2)^2 = 1/2, tg(-П/3) = -tg(П/3) = -√3
sin^2(-П/6)-cos^2 П/4+tg(-П/3) = 1/4 - 1/2 - √3 = -1/4 - √3
В) cos(-П/2) = cos(П/2) = 0, cos(-П/4) = cos(П/4) = 1/√2, tg(-П/4) = -tg(П/4) = -1
cos(-П/2)cos(-П/4)tg(-П/4) = 0 (1/√2) (-1) = 0