Sum and Difference Identities · Exercise 39

Use a graph to determine whether the functions are the same or different. If they are the same, show why. If they are different, replace the second function with one that is identical to the first. (Hint: think $2x=x+x.$ )

$f\left(\theta \right)=tan\left(2\theta \right),g\left(\theta \right)=\frac{tan\theta }{1+ta{n}^2\theta }$

OpenStax, Algebra and Trigonometry 2e · §9.2 Sum and Difference Identities · Exercise 39