Also, to make it more obvious that it is the tangent function.
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How on earth is it 'Open Range'?
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Just to clarify, by "third one", I mean the one which has D -f-> R. The elements that a function maps to makes up the range (well, most texts refer to it as the image, but I'll let it slide). A set of numbers can be what is known as "open", and this is indicated informally here by the dashed circle. Hence, the range is open, i.e. Open Range.
Edit: the last one might be Absolute Power.
Edit edit: I'd guess five is The Odd Couple, and nine is Transformers.