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Use the Half-angle Formulas to find the exact value of the trigonometric function.
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Q20: <span class="ql-formula" data-value="\mathrm { a } =
Q27: <span class="ql-formula" data-value="f ( x ) =
Q90: <span class="ql-formula" data-value="\cos ^ { - 1
Q116: <span class="ql-formula" data-value="y=-3 \cos (x-\pi)"><span class="katex"><span class="katex-mathml"><math
Q207: <span class="ql-formula" data-value="\cot 0.1811"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>cot</mi><mo></mo><mn>0.1811</mn></mrow><annotation
Q210: <span class="ql-formula" data-value="\mathbf { v } =
Q300: <span class="ql-formula" data-value="\text { Rewrite in terms
Q313: <span class="ql-formula" data-value="\cos 285 ^ { \circ
Q343: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6901/.jpg" alt=" A)
Q474: <span class="ql-formula" data-value="f ( x ) =