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Irene Stone on Twitter: "What mnemonic do you use to remember ASTC when teaching Unit Circle? I was taught CAST but confusing as starts in Quadrant 4? A student of mine a
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trigonometry - I don't understand what my Calculus hw question is asking of me...not looking for answers, just guidence. - Mathematics Stack Exchange
What is the best way to remember trigonometric formulas like sin (90+x), cos (180-x), and sin (180+x)? - Quora
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