E=2 (sen40°. 1 / sen 40°) + (tan20°.cot20°)
tanx°.cotx° = 1
E= 2 . 1 + 1 = 3
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E=2 (sen40°. 1 / sen 40°) + (tan20°.cot20°)
tanx°.cotx° = 1
E= 2 . 1 + 1 = 3