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Determine the sign (positive or negative) of the given value without use of a calculator.
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Q51: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8181/.jpg" alt=" Find
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Q215: Initial value <span class="ql-formula" data-value="=
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Q468: <span class="ql-formula" data-value="y=-\csc \left(\frac{x}{4}\right)"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>y</mi><mo>=</mo><mo>−</mo><mi>csc</mi><mo></mo><mrow><mo