Use cofunction identities and trig identities to find the indicated trig functions

The video tutorial explains how to evaluate the cosine of a negative angle, starting with the cosine of t being -3/4. It highlights the property of cosine as an even function, meaning cosine of t equals cosine of negative t. The tutorial concludes that the cosine of negative t is also -3/4.

What is the initial value given for cosine of t?

• -1/2

• 1/2

• -3/4

• 3/4

Which of the following is a property of even functions?

• f(x) = -f(-x)

• f(x) = f(-x)

• f(x) = 2f(-x)

• f(x) = 0

What is the relationship between cosine of t and cosine of negative t?

• They are unrelated

• They are opposites

• They are equal

• One is double the other

If cosine of t is -3/4, what is cosine of negative t?

• 0

• -3/4

• 1

• 3/4

What does the conclusion of the video emphasize about cosine of negative angles?

• They are undefined

• They are always zero

• They are equal to cosine of positive angles

• They are always positive