(2) Find the number of minutes in the extreme right-hand column, reading

from the bottom toward the top.

(3) Locate the proper column for the function, using the headings at the

bottom.

(4) Find the value of the function in this column at a point directly

across from the given number of minutes.

EXAMPLE

Find the sine of 46,, 15'; that is, sine 46,, 15' = ?

SOLUTION

For angles between 45,, and 90,,, the value of the sine is found in the column

marked "sine" at the bottom. The "minutes" column is followed up to 15',

and then in the "sine" column at a point across from 15', sin 46,, 15' =

.72236.

EXAMPLE

Find the tangent of 45,, 48'; that is, tan 45,, 48' = ?

SOLUTION

For angles between 45,, and 90,,, the value of the tangent is found in the

column marked "tangent" at the bottom . The "minute" column is followed up

to 48', and then in the "tangent" column at a point across from 48', tan 45,,

48' = 1.02832.

7.

Angle Corresponding to a Given Function

In the preceding examples and problems, finding the value of the

trigonometric function of a given angle has been discussed.

It is also

necessary to understand the reverse of this procedure; that is, how to use

the tables of trigonometric functions to find the angle corresponding to a

given trigonometric function. The procedure is as follows:

a.

Locate the given number (value of function) such as the sine of .69466

in the proper column,