Trigonometry Examples

$1 - \sin^{2} (x) - \sin^{2} (x) = 1 - 2 \sin^{2} (x)$

Step 1

Start on the left side.

$1 - \sin^{2} (x) - \sin^{2} (x)$

Step 2

Subtract ${\sin (x)}^{2}$ from $- {\sin (x)}^{2}$ .

$1 - 2 \sin^{2} (x)$

Step 3

Because the two sides have been shown to be equivalent, the equation is an identity.

$1 - \sin^{2} (x) - \sin^{2} (x) = 1 - 2 \sin^{2} (x)$ is an identity