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cos2x(2cosx — l) = cot 2x sin2x(2cosx — l) sin4,. sin3t sin 21 cos4t cos3t v cos2t sin4' V sin 2/ + singt 2sin3rcost sin3r cos4t + cos 2/ cos3r 2cos cos3r tan2A— gS. COS2A 99. 100. tan— cos2A — sin2A COS A — cosA sinA Section 6.4 Practice Exercises, pp. 648—651 ................
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