Use a Calculator to Find the Function Value $\mathrm { F }$

Use a calculator to find the function value. Give your answer rounded to seven decimal places, if necessary.
-The grade resistance $\mathrm { F }$ of a car traveling up or down a hill is modeled by the equation $\mathrm { F } = \mathrm { W } \sin \theta$ , where $W$ is the weight of the car and $\theta$ is the angle of the hill's grade $( \theta > 0$ for uphill travel, $\theta < 0$ for downhill travel) . A 2025-lb car has just rolled off a sheer vertical cliff $\left( \theta = - 90 ^ { \circ } \right)$ . What is the car's grade resistance?

A) $0 \mathrm { lb }$
B) undefined
C) $2025 \mathrm { lb }$
D) $- 2025 \mathrm { lb }$