Question: In Example 2, change the sign in the numerator to +. Data from Example 2 Simplify by expressing the result in terms of one-half

In Example 2, change the − sign in the numerator to +.

Data from Example 2

Simplify

1 - cos 114 2

by expressing the result in terms of one-half the given angle. Then, using a calculator, show that the values are equal. We note that the given expression fits the form of the right side of Eq. (20.26), which means that

Using a calculator shows that

which verifies the equation for these values.

1 - cos 114 2

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