Calculated Industries 4095-C User Guide - Manual (Page 7)

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Using Parentheses
Your calculator has parentheses keys  and  for performing
mathematical operations. (In the Order of Operations method,
expressions inside of parentheses are performed first.)
The calculator offers up to 21 levels of parenthesis:
1) First parenthesis level opened – press  for one right-
sided parenthesis.
2) Second level opened – press  a second time for two
right-sided parentheses  .
3) Third level opened – press  a third time for three right-
sided parentheses   .
4) Fourth level opened – press  a fourth time for four right-
sided parentheses    .
Numbers of levels greater than four are shown in the upper
left corner of the display.