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Are pupils a special zodiac sign?
You can set a= b= c= and then substitute it according to the formula. ...

Enter the number you want to set first, then press SHIFT, then press RCL, then press the letter you want to set, and you will see the page {2→A 2}, and then enter b c in turn.

Use the formula (-b √ B2-4ac) ÷ 2.

To have (-b √ B2-4ac) ÷ 2, you follow me (you have to set ABC first).

1 RCL (-) means RCL) means X X2+. ,, that is, b) that is, X+hyp that is, C = ok.

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