Evaluate the following integrals, the contour C being taken in counter-cbckwise sense cosh (2 - xi) z- ni (4) dz; C the rectangle with vertices + 4 and +1+ di dz; C: |z| =2 sin (iz) 2dz; C the triangle with vertices at 1-2i, -1-2 and 2i.

need help with question C and D please help

Find leg

2. Consider the function y(x) = 5x over the interval [0, 10]. (a) If the points A(0, y(0)), B(5, y(5)), and C(10, y(10)) are on the curve represented by the above function, find the slope of the lines (secants) AB, and AC, respectively. (b) If x represents time and y represents the displacement of a particle moving along a line, what is the physical meaning of your results to part (a)? (c) Now consider a point D(10 – h, y(10 – h)) on the curve represented by the given function, find the slope of the line DC. (d) As h → 0, what is the limiting value of your result to part (c)? (e) What is its physical meaning of your result to part (d) if again x represents time and y represents the displacement?