4.3 sin 1470° + cos 600° + tg 945° + ctg 405°

sin(1470°) = sin(1470°-4*360°) = sin(30°) = 1/2; cos(600°) = cos(600°-360°) = cos(240°) = cos(180°+60°) = -cos(60°) = -1/2; tg(945°) = tg(945°-2*360°) = tg(225°) = tg(180°+45°) = tg(45°) = 1; ctg(405°) = ctg(405°-360°) = ctg(45°) = 1. 1/2 -1/2 + 1 + 1 = 2