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Home > PC > Chapter 4 > Lesson 4.2.4 > Problem 4-112

4-112.

Substitute a Pythagorean Identity for sec2x.

Substitute the Fundamental Pythagorean Identity into the left side of the equation for sin2α.

Substitute a Pythagorean Identity for sec2x.

Rewrite tan y as sin y / cos y.
Get common denominators and simplify.