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$cosA=adjacent leghypotenuse,sinA=opposite leghypotenuse,tanA=opposite legadjacent leg,secA=hypotenuseadjacent leg,cscA=hypotenuseopposite leg, and cotA=adjacent legopposite leg.$ (Error compiling LaTeX. Unknown error_msg)
$sin30∘=12,cos30∘=32,tan30∘=33,sin45∘=22,cos45∘=22,tan45∘=1,sin60∘=32,cos60∘=12, and tan60∘=3.$ (Error compiling LaTeX. Unknown error_msg) <img src="https://latex.artofproblemsolving.com/8/6/5/865494988ab38b5d8adf1df23b29902b8831d48f.png"></img> $sin2θ+cos2θ=1,cosθ=cos(−θ),sinθ=−sin(−θ),cosθ=−cos(180∘−θ), and sinθ=sin(180∘−θ).$ (Error compiling LaTeX. Unknown error_msg) Credits to heatherfinotti for these charts
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