Trigonometry Examples

$\sqrt{- \frac{49}{81}}$

Step 1

Rewrite $- \frac{49}{81}$ as ${(\frac{7 i}{9})}^{2}$ .

$\sqrt{{(\frac{7 i}{9})}^{2}}$

Step 2

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

$\frac{7 i}{9}$