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

The video tutorial explains how to find the cosine of an angle using the reciprocal identity. It begins by introducing the relationship between cosine and secant as reciprocals. The cosine of an angle in a triangle is defined as the ratio of the adjacent side to the hypotenuse. The tutorial then demonstrates how to apply the reciprocal identity by converting secant of Theta equals five into a fraction, allowing the calculation of cosine as 1/5. The video concludes with a summary of the process.

What is the relationship between cosine and secant?

• They are equal.

• They are complementary.

• They are reciprocals.

• They are supplementary.

In a right triangle, how is cosine of an angle defined?

• Adjacent over hypotenuse

• Opposite over hypotenuse

• Hypotenuse over adjacent

• Hypotenuse over opposite

How is secant of an angle represented in terms of a right triangle?

• Adjacent over hypotenuse

• Adjacent over opposite

• Opposite over adjacent

• Hypotenuse over adjacent

If secant of Theta is 5, what is the cosine of Theta?

• 5

• 1/5

• 1

• 0

How can secant of Theta be expressed to find cosine?

• As a whole number

• As a decimal

• As a fraction

• As a percentage