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.

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