Work out tan(19pi/4) without a calculator

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.