- #1

ShizukaSm

- 85

- 0

## Homework Statement

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:

[itex]f(\theta)=\cos(\theta)+ 0.4sen(\theta)[/itex]

## Homework Equations

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:

[itex]f(\theta)=\sqrt{1-\sin^2(\theta)}+ 0.4sin(\theta)[/itex]

But I also don't know how to find the minimum in this equation.

How could I go about solving that?

Thanks in advance!

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