Trigonometry Examples

$\cos (x + \frac{3 π}{4}) - \cos (x - \frac{3 π}{4}) = 1$

Step 1

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

Step 2