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1975 AHSME Problems/Problem 30: Revision history

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  • curprev 06:0906:09, 17 May 2016 Quantummech talk contribs 287 bytes +287 Created page with "==Problem 30== Let <math>x=\cos 36^{\circ} - \cos 72^{\circ}</math>. Then <math>x</math> equals <math>\textbf{(A)}\ \frac{1}{3}\qquad \textbf{(B)}\ \frac{1}{2} \qquad \textbf..."
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