Question

Pleaseeee!
I need help evaluating this:


Tan 2 theta-(1-tan^ 2 )=?​

Answer 1

`\tan \left(2\theta\right)-1+\tan ^2\left(\theta\right)`

Key:

•
`-\left(a-b\right)=-a+b`

Explanation:

`\tan \left(2\theta\right)-\left(1-\tan ^2\left(\theta\right)\right)`

`-\left(1-\tan ^2\left(\theta\right)\right)=-1+\tan ^2\left(\theta\right)`

`=\tan \left(2\theta\right)-1+\tan ^2\left(\theta\right)`