1) tg30 = sin30/cos30 = 1/root(3), cos30 = root(3)/2, sin30 = 1/2, tg45 = 1, tg30 = 1/root(3)

Выражение равно (1/root(3)) (root(3)/2) (1/2) 1 (1/root(3)) = 1/4

2) cos(2)30 = cos^2(30) - sin^2(30) = (root(3)/2)^2 - (1/2)^2 = 3/4 - 1/4 = 1/2
sin(2)30 = 2sin30cos30 = 2(1/2)(root(3)/2) = root(3)/2
cos(2)60 = cos^2(60) - sin^2(60) = (1/2)^2 - (root(3)/2)^2 = 1/4 - 3/4 = -1/2
sin(2)60 = 2sin60cos60 = 2(root(3)/2)(1/2) = root(3)
cos(2)45 = cos^2(45) - sin^2(45) = (1/root(2))^2 - (1/root(2))^2 = 1/2 - 1/2 = 0
sin(2)45 = 2sin45cos45 = 2(1/root(2))(1/root(2)) = 1

Выражение равно 1/2 * root(3)/2 - (-1/2) - root(3) + 0 + 1 = root(3)/4 + 1/2 - root(3) + 1 = 1/2 + 1 - root(3)