Unexpectedly 'Derivative' function in CAS got the wrong answer!

Sherif Ibrahim Seif shared this problem 6 months ago
Solved

Hi,

When I plugin f(sec(x)) inside the Derivative function where f is an arbitrary function, sec is reciprocal of the cosine function.

Derivative(f(sec(x)),x) returns (sin(x) * f'(1 / cos(x) / (cos(x))^(2))) instead of (sin(x) / (cos(x))^(2) * f'(1 / cos(x)))

By applying the chain rule /cos(x)^2 should be outside the f' function not inside as CAS return.

You can check wolfram alpha if this isn't clear.

I hope you get the idea.966d8fd69196f30037f5759efe47c93a

Comments (1)

photo
1

Fixed for v650

Comments have been locked on this page!

© 2021 International GeoGebra Institute