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Solve the triangle.
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Q20: <span class="ql-formula" data-value="\mathrm { B } =
Q117: <span class="ql-formula" data-value="\mathrm { a } =
Q155: <span class="ql-formula" data-value="y = - 3 \sin
Q199: <span class="ql-formula" data-value="\arccos 0.55"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>arccos</mi><mo></mo><mn>0.55</mn></mrow><annotation
Q235: <span class="ql-formula" data-value="\cos ^ { 2 }
Q273: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8181/.jpg" alt=" A)
Q340: <span class="ql-formula" data-value="\sin \alpha"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>sin</mi><mo></mo><mi>α</mi></mrow><annotation
Q406: <span class="ql-formula" data-value="\tan x = 5 \sin
Q408: <span class="ql-formula" data-value="y = \sin ^ {
Q437: <span class="ql-formula" data-value="\cos \theta"><span class="katex-display"><span class="katex"><span class="katex-mathml"><math