A wrench of length \(L\) is used to tighten a bolt located at a pivot point \(P\). The wrench is oriented at an angle \(\theta\) above the positive \(x\)-axis. A person applies a force of magnitude \(F\) to the end of the wrench. The force is directed at an angle \(\phi\) below the positive \(x\)-axis, as shown in the figure.

Which of the following expressions correctly represents the magnitude of the torque exerted by the force \(F\) about the pivot \(P\)?