# How do you simplify the expression -(sin^2x+cos^2x)?

Jun 25, 2018

-1 is the answer to the given expression.

#### Explanation:

We know,

$\textcolor{red}{{\sin}^{2} x + {\cos}^{2} x = 1}$

$\textcolor{red}{- \left({\sin}^{2} x + {\cos}^{2} x = - \left(1\right)\right)}$

From the expression we also see
${\sin}^{2} x = 1 - {\cos}^{2} x$