It's a casio fx-82ES Plus calculator. Note that it's not tan(55)^2 but it's tan^2(55), this is for geotechnical engineering purposes.
It's a quirk of notation. When a book says tan^2(x), it actually means (tan(x))^2. Only the trigonometric and hyperbolic functions seem to get written this way. If one wants the square of a logarithm, for example, one doesn't write log^2(x).
The short answer: if you want tan^2(55), calculate tan(55) then square it.
SOURCE: casio fx-82ES scientific calculator
change the mode to stat and then start operating it in statistical mode
SOURCE: Convert to Binary in Casio fx-82ES
dear kladofora thire is no 4:BASE-N in the mode please i need help Gist
SOURCE: casio fx-82es significant figures
it should...
it can be found by SHIFT then MODE then SCI is the one you want to choose
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