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1—tan® 30° 1SE B’ = T 3.1 Etan” g0 2 |
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Answer» cos(60°) = 1/2 1 - tan²(30°)-------------------1 + tan²(30°) 1 - (1/√3)²-----------------------1 + ( 1√3)² 1 - 1/3---------------1 + 1/3 2/3-------------- 4/3 = 1/2 |
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