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Hello!

When issuing into icas commandline, the output is
However, when issuing
the output is
Why is the output not consistent (either decimal result or same as input in both cases)? Can this be made consistent?

It is consistent. For sin(pi/7) the input is exact, therefore the answer is exact, while for sin(pi/6.99) the input is approx. If you want an approx answer for the first input, enter sin(pi/7.0) instead.