Consider the following keystroke sequences:

6 ENTER ENTER / - 3 ENTER . 3 /andx9 ENTER ENTER / - * 9 / 6 ENTER 3 / ENTER + 3 ENTER . 3 /^{y}xENTER + 9 / 1/x -^{y}

3 0 ENTER 3 / piBoth produce the same numerical result on the display (you'll have to key either one in to find out what it is). The more straightforward sequence is 36 keystrokes long. The somewhat exotic one is 49 keystrokes long. The goal is to find equivalent keystrokes sequences, the shortest the best, but interesting sequences using transcendental functions are welcome as well.x3 sqrt 9 0 6 0 ENTER 3 0 / 3 0 - + 3 0 * 3 0 + pi 3 0 / + 3 sqrt / 3 sqrt 3 / + - 6 ENTER 9 / 3 0 / -^{y}

Rule: Use *only* keys in the first and last rows and in the first and last columns.

For test purpose only, you can use an HP-45 (just remember to replace *x ^{y}* with

*x<>y y*).

^{x}Have fun! :-)