1. The point (1,-7) is on a circle k, which has its
centre at 0(0,0)
Sketch the circle k.

Find the cosine function that is represented in the graph.

If value of cos330° is √3/2 then find tan165°.

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.