计算sin²25°+tan55°*tan35°+cos²25°-tan²30°

计算sin²25°+tan55°*tan35°+cos²25°-tan²30° 计算tan55°tan35°+sin（70°-x）/cos（x+20°）+1的值. 计算sin²1°+sin²2°+……+sin²89° 实数计算sin²25°+sin²65°,和 sin²20°+sin²70° 等于多少 ,理由说详细点 .那个 ² 是啥意思?知道是平方 (tan55°-tan10°)÷(1+tan55°×tan10°) 化简求值 求详细过程 tan65°+tan55°- 根号3tan65°tan55°= sin²30°+2sin60°+tan45°+cos²30° 计算 sin²1°+sin²2°+sin²3°+.+sin²89 计算sin²10°+sin²50°+sin10°sin50°的值详细答案 计算1-2sin²22.5 sin55°、cos55°、tan55°的大小关系是什么? sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°+sin²90°=等于多少? 计算：① sin²45°+cos²30°-1/3tan²60° ②1/tan45°-cos²60°/1+sin30° tan(-35π/6)*sin(-46π/3)-cos37π/6*tan55π/6怎么做 sin²1°+sin²2°+…+sin²88°+sin²89°= 求sin²1°+sin²2°+sin²3°……sin²89°=? sin²1°+sin²2°+……+sin²88°+sin²89°=? sin²1°+sin²2°+sin²3°+.+sin²89°= -1为什么?