（1）sin^2(62°)+tan54°tan45°tan36°+sin^2(28° )= sin^2(62°) + tan54°tan45°tan(90°-54°)+sin^2(90°-62° )= sin^2(62°) + tan54°tan45° cot54° + cos^2(62° )= sin^2(62°) + cos^2(62° )+ tan5...