Chapter 13.2, Problem 9OE

To determine

To find: Complete the table by using positive or negative for each entry .

Answer to Problem 9OE

The table will be positive ,negative negative and positive .

Explanation of Solution

Given information:

Angle	$\cos s$
$0<s<\frac{\pi }{2}$
$\frac{\pi }{2}<s<\pi$
$\pi <s<\frac{3\pi }{2}$
$\frac{3\pi }{2}<s<2\pi$

Calculation:

The trigonometry table from $0<s<2\pi$ by using positive or negative is given below: .

Angle	$\cos s$
$0<s<\frac{\pi }{2}$	$+$
$\frac{\pi }{2}<s<\pi$	$-$
$\pi <s<\frac{3\pi }{2}$	$-$
$\frac{3\pi }{2}<s<2\pi$	$+$

The table will be positive ,negative negative and positive .