What does a negative A value cause? A reflection across X axis A reflection across the Y axis No effect A negative amplitude

## Step 1<br />In the context of trigonometry, the variable 'A' typically represents the amplitude of a function. The amplitude is the maximum distance from the equilibrium position (usually the x-axis) to the peak or trough of a wave.<br /><br />## Step 2<br />When 'A' is negative, it does not cause a reflection across the X or Y axis. Instead, it changes the direction of the wave.<br /><br />## Step 3<br />A negative 'A' value inverts the wave, meaning it flips the wave upside down. This is equivalent to a reflection across the X-axis.<br /><br />## Step 4<br />However, it's important to note that this is not a reflection across the Y-axis. A reflection across the Y-axis would mean that the wave is mirrored along the Y-axis, which is not the case here.<br /><br />## Step 5<br />Lastly, a negative 'A' value does not have no effect on the wave. It does change the direction of the wave, which is a significant effect.