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Wish I had this Precalculus for dummies cheat sheet like 6 years ago...

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misscalcul8: Trig Unit 4: Unit Circle Interactive Notebook

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10 Secret Trig Functions Your Math Teachers Never Taught You...(because they are from a pre-calculator world) A diagram with a unit circle and more trig functions than you can shake a stick at. (It's well known that you can shake a stick at a maximum of 8 trig functions.) The familiar sine, cosine, and tangent are in blue, red, and, well, tan, respectively. The versine is in green, and the exsecant is in pink. Excosecant and coversine are also in the image.

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misscalcul8: Trig Unit 4: Unit Circle Interactive Notebook

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My memory for this kind of thing was much better back in high school, but this still could have been helpful for those pesky reference angles!

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Trig Reference sheet with ALL those identities, formulas, also includes Taylor Expansions, Unit Circle and tables of values

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Calculus for Beginners and Artists is an online textbook that provides an overview of Calculus in clear, easy to understand language designed for the non-mathematician. Thank you MIT OpenCourseWare for awesome, free resources and classes!!!

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I don't ever plan on teaching high school math, but you never know. This looks helpful.. maybe for friends still in college.

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Full explanation Hand unit circle - I might mirror it on my right hand instead so that my cosine is on the left and sine is on the right.

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Resourceaholic: I love my new circle theorems wall. It was an easy and enjoyable lesson to run - I just gave them paper plates, straws and pins and they got on with it!

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