a. Find ∫ [dx/(x2+49)].
∫ [dx/(x2+49)] = (1/7).tan-1(x/7) + C
b. Sketch the region in the plane defined by y<=|2x+3|.
Sketch y=|2x+3|, and shade under the function.
c. State the domain and range of y=cos-1(x/4).