This question about sin(pi/2) = 0 was reopened, but the important information (how is pi defined) is still missing. I suggest to close the question again.
Request that this question be re-opened. Originally, the question was poorly expressed, but has since been edited. Further, currently the question continues to show analytical errors, which may have influenced potential close-voters.
@user2661923 Generally speaking, "Does this process looks okay?" is not really a good fit for the SE model. They are not highlighting some specific problem that they are having, and are essentially asking the SE community to grade their homework for them. I'm not in favor of reopening.
I don't understand why my comment was removed here. From the comments and last lines of the post it's clear that OP is asking for his proof to be checked
I don't understand why my comment was removed here. From the comments and last lines of the post it's clear that OP is asking for his proof to be checked
