pls

[tired quarry]

how come mark schemes never include a mod for ln x ?

[proven garnet]

I think in many applied calculus problems, especially differential equations -variables like time, length, or population are assumed to be positive (x > 0), so the modulus isn't strictly needed.

[tired quarry]

this isn't in an applied one though

so idk

[proven garnet]

Got it. for this specific case since they multiply by 2 & it becomes ln x^2 in step 3. The mod becomes redundnat anyway

[orchid tulip]

what was the original q