Half angle formula cosine

The video tutorial explains how to evaluate the half angle formula by plugging in values and simplifying complex fractions. It covers determining the sign of the angle, simplifying fractions by finding a common denominator, and performing calculations to arrive at the final result.

What is the primary focus when evaluating the half angle formula?

• Determining the angle's sign

• Finding the exact value of theta

• Calculating the sine of the angle

• Identifying the angle's quadrant

Why is it important to eliminate complex fractions in calculations?

• To simplify the expression

• To increase the number of terms

• To make the expression more complex

• To change the angle's sign

What is the common denominator used to simplify the fractions in this example?

• 10

• 5

• 3

• 2

What is the result of multiplying 5 by -3/5?

• 0

• 3

• -3

• -15

What is the final simplified form of the expression?

• sqrt(5)/5

• 5/3

• 1/sqrt(5)

• 2/10