I’ve always wondered what F1, F2, F3, and F4 do on the Sharp EL-520W. It turns out they can be used to store formulas.<\/p>\n
Example 1: Store, in F3, the formula for the surface area of a cylinder,<\/strong><\/p>\n 2π r^2 + 2πrh<\/p>\n Solution: The alpha keys may not include both r and h; furthermore, they’re caps. We’ll have to rewrite the formula, perhaps with A as the radius and B as the height:<\/p>\n 2πA^2 + 2πAB<\/p>\n Now we key in the formula, first pressing the ALPHA<\/span> key before each letter. For instance, to key A, press ALPHA<\/span> CNST; B is ALPHA<\/span>\u00a0y^x.<\/p>\n When\u00a0 2πA^2 + 2πAB is typed across the screen, press STO then F3.<\/p>\n Example 2: Assume the formula 2πA^2 + 2πAB is stored in F3. Find the result when A=6.5 and B=7.<\/strong><\/p>\n Solution:<\/p>\n First, we need to store 6.5 in A and 7 in B:<\/p>\n Key in 6.5 STO CNST (no ALPHA<\/span> needed), then 7 STO y^x.<\/p>\n Now, to evaluate, key RCL then F3 then =. Hopefully you receive the answer 551.3495107 across the screen.<\/p>\n HTH:)<\/p>\n Source:<\/p>\n Sharp Scientific Calculator Model EL-520W Operation Manual<\/i>.<\/p>\n