At what angle do the two forces (P + Q) and (P – Q) act so that the resultant is `sqrt(3P^(2)+Q^(2))`.

Explanation

To solve the problem of finding the angle at which the two forces \( (P + Q) \) and \( (P - Q) \) act so that their resultant is \( \sqrt{3P^2 + Q^2} \), we can follow these steps:

### Step 1: Write down the expression for the resultant of two forces
Using the law of vector addition, the magnitude of the resultant \( R \) of two forces \( A \) and \( B \) acting at an angle \( \theta \) is given by:
\[ R = \sqrt{A^2 + B^2 + 2AB \cos \theta} \]
In our case, we have:
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