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If you don't wanna draw triangles and circles on your web page probably nowhere
PI is the constant 3.14 (most common estimate) that represents the ratio of a circle's circumference to its diameter. in simpler terms you need 3 of a cirlce diameter to make a new cirlce that big and .14 in length of the diameter to complete it as 3 of the diameters cannot make the whole circle check out: https://youtu.be/cC0fZ_lkFpQ as for tan and sin, these are trigonometric functions
your top question is not clear and the tag 'me' is irrelevant, please read this post https://www.sololearn.com/discuss/1316935/?ref=app
Lexfuturorum i understand that part but the top question 'JS' is unclear
And befor I give you the second answer I have to know. Did you finish school already?
Mind To Machine 💻🕆 he wants to know about sinuous, cosenuos and tangent And tere uses in web development. Pretty clear question for me