The following equation is obviously wrong:
1) Can you add 4 lines to make it correct?
2) Can you add 3 lines to the equation and make it correct to six decimal places?
As ever, please do NOT post your answers, but do say if you think you have solved it and how long it took. Solution on Monday.
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.