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

The video tutorial explains the relationship between the cosine of 60 degrees and the cosine of 30 degrees using cofunction identities. It introduces the concept of cofunction identities, which state that the sine of 90 degrees minus an angle is equal to the cosine of that angle, and vice versa. The tutorial demonstrates how these identities can be applied to determine that the cosine of 30 degrees is equal to the square root of 3 over 2, by showing that the sine of 60 degrees is equal to the cosine of 30 degrees.

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