Codercise H.3.1a Math calculation

For the calculation on the expectation value of Y (under the Time Evolution section), i got -sin(2alphat) by using the same method as finding for X and also tried by expanding to the 0 and 1 basis states. How was +sin(2alphat) obtained?

Hi!
Thanks for this.
I believe you are right. I just verified the calculation and got the minus sign.
I will talk to the author of the module and fix this.

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