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TRIGONOMETRIC OF TWO OF SUM AND DIFFERENCE OF TWO ANGLES；林鹤一（著）；矢袋喜一（著）；骆师会</div>
<bdi><a href="https://en.wikipedia.org/wiki/en:Wuhan_University" class="extiw" title="w:en:Wuhan University"><span title="university in Wuhan, China">Wuhan University</span></a>
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