To find the cosecant of angle \( X \) in the right triangle, we need to recall the definitions of trigonometric functions.
The cosecant (abbreviated as csc) of an angle is the reciprocal of the sine of that angle.
In a right triangle:
- The sine of angle \( X \) is given by the ratio of the length of the side opposite to angle \( X \) (which is side \( x \)) to the length of the hypotenuse (which is side \( z \)).
Thus, we have: \[ \sin X = \frac{x}{z} \]
Therefore, the cosecant of angle \( X \) is given by: \[ \csc X = \frac{1}{\sin X} = \frac{z}{x} \]
In the given responses, this corresponds to: \[ \text{cosecant } X = \frac{z}{x} \]
So, the correct answer is:
- cosecant upper X equals Start Fraction z over x End Fraction.