Trigonometry Examples

$- \sqrt{- \frac{16}{49}}$

Step 1

Rewrite $- \frac{16}{49}$ as ${(\frac{4 i}{7})}^{2}$ .

$- \sqrt{{(\frac{4 i}{7})}^{2}}$

Step 2

Pull terms out from under the radical, assuming positive real numbers.

$- \frac{4 i}{7}$