For triangle ABC, line AC≅ line AB. Which set of measures is possible for angle CAB and angle CBA? (All angles look like acutes in the picture(isosceles triangle)) 1: m∠CAB=45∘, m∠CBA=90∘
2: m∠CAB=20∘, m∠CBA=60∘
3: m∠CAB=30∘, m∠CBA=30∘
4: m∠CAB=25∘, m∠CBA=35∘

Find a parametrization for the curve「and determine the work done on a particle moving along γ in r3 through the force field f: r^3--r^3'where f(x, y,z) = (1,-x, z) and (a) im (γ) is the line segment from (0,0,0) to (1,2,1) (b) im (γ) is the polygonal curve with successive vertices (1,0,0), (0,1,1), and (2,2,2) (c) im (γ) is the unit circle in the plane z = 1 with center (0,0,1) beginning and ending at (1,0,1), and starting towards (0,1,1)