V ariable command and specify x as a nonnegative number. Next, we issue the M anage L ogarithm command to control the direction of simplification and choose the Expand option. L ogarithm menu must be chosen to S implify in the opposite direction and combine sum of logarithms into the logarithm of a product. In order to illustrate that Derive only does those simplifications about which it is sure that the transformations are valid, we enter under the above circumstances the following sum of logarithms. Simplification only partly combines logarithms.
Trigonometric simplification is another highlight of Derive .
Use the M anage T rigonometry menu and choose the direction of simplification and the preference of simplification of powers of sines or cosines. The Auto option can be chosen when you leave it up to Derive to make a heuristic choice. On its turn, choosing the Collect direction, gives back the original expression upon simplification.