I am struggling to find the 'i' (for imaginary number) key that is referred to in the documentation. Can anyone help, please?

It is the Degrees minute and second button for angular arithmetic the D,m,s at the top right hand of the keyboard and is attached to it with a white line and will probably only work in the complex number mode accessed from within the menu for as a silver function Hope this helps

Question was, if you can deliver it to Stockholm, Sweden and what will be the delivery cost on top?

I didn’t have to pay for delivery cost

Is this the calculator with 640 functions?

Yes it is! And does 4x4 matrices

Please tell me the instructions are in English?

Yes the instruction is in English.

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Deliver to Sri Lanka

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