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![Why are the x-values [-pi/2, pi/2] here? I thought pi/2 meant 90 degrees on a unit circle. I'm confused. : r/calculus](https://preview.redd.it/why-are-the-x-values-pi-2-pi-2-here-i-thought-pi-2-meant-90-v0-5ndduwasnjfa1.jpg?auto=webp&s=3d166538553228ff03481e5a7fcbef687dcfaef0 "Why are the x-values [-pi/2, pi/2] here? I thought pi/2 meant 90 degrees on a unit circle. I'm confused. : r/calculus")
Why are the x-values [-pi/2, pi/2] here? I thought pi/2 meant 90 degrees on a unit circle. I'm confused. : r/calculus
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