I think all that you have to do is press 9 as many times as you can until it wont go any further!! Just remember I am only 11 and I don't really get this question anyway! LOL :)
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62.50 this is from Gardiany
No, because 'x' is a variable.
There
On a Texas Instruments calculator you can use abs. Other calculators may need a manual to find the steps.
sine tables, that's how they did it before calculators, there are formulas as well