I doubt the author performed annoying trigo calculations, so I tried to figure out such a solution, which you can see in the capture (in fact there is idea for a 2nd solution in Remark, that one I first saw):
I doubt the author performed annoying trigo calculations, so I tried to figure out such a solution, which you can see in the capture (in fact there is idea for a 2nd solution in Remark, that one I first saw):
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