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  • mohammadrezaaalaei commented,

    Thank you Jessica. I appreciate your explanation and the time you've spent on this comment. your explanation was so clear and understandable. but you know, we have some notions in trigonometry such...

  • mohammadrezaaalaei created a post,

    the concept of Tangent line

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    Hi, When we talk about a line that is tangent to a point on some curve I can't understand the relationship between this tangent and the tangent notion which is in trigonometry (that is sine/cosine ...

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