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Evaluate the trigonometric function at the quadrantal angle, or state that the expression is undefined.
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Q219: <span class="ql-formula" data-value="\log 1000"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>log</mi><mo></mo><mn>1000</mn></mrow><annotation