It isn't a homework problem per se, but a curiosity a stumbled upon when trying to solve a physics problem (I was trying to calculate the angle I would need to do less work possible, while moving the box). The equation I found is:
Just the one stated above, and trig identities, probably.
The Attempt at a Solution
I tried a few things (including deriving and finding the roots of the function without success, since I couldn't found the roots), I also tried to rewrite (Using cos² + sin² = 1) and got:
But I also don't know how to find the minimum in this equation.
How could I go about solving that?
Thanks in advance!