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1-Newbie

## New to Mathcad Prime 3

Just learning mathcad prime 3 and cannot find answers to the following. Any help will be appreciated. Thanks.

1) When using the prime notation for derivative, I cannot use CTRL. to see the derivative as a function of x if the original function is sin(2x). All is fine with the function sin(x). In particular, if I define f(x):=sin(2x) and use CTRL' to define fp(x):=f'(x), I get an error when I type fp(x) and then CTRL.

2) Again when using prime notation for the derivative, I can see the derivative if the function is x*sin(x) but I get the notation sin and cos rather than sin(x) and cos(x)

3) Is there a way to have equal scaling on the axes when plotting? For instance, I would like to see an ellipse when plotting parametrically the functions x=cos(t) and y=2sin(t).

Roger