**Claim:**Pocket calculators as we know them can be seen as number crunchers calculating with whatever numbers are thrown at them.

**Proof:**Take the famous processor check

**and calculate inside out as we all were taught:**

*arcsin(arccos(arctan(tan(cos(sin(9°)))))*returns a real number*sin*(9°)**A**, certainly not an angle; but what shall bethen? And*cos*(A)?*tan(cos(A))*- With the latter returning a real number
**B**, however,will definitely return an angle*arctan*(B)**C**; but what shallreturn then? And*arccos*(C)?*arcsin(arccos(C))* - Q.e.d.