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In Algematics, the power operator button: works on algebraic expressions and equations as well as numbers.

Click to combine two things: 

1. The selected number, expression or equation, and

2. the contents of the input box: 

Example 1: The input box contains the number 4, then clicking once does this:

Example 2: The input box contains the expression: 2t + 1, then clicking once does this:

Example 3: The input box contains the number 3, then clicking once does this: