计算sin²10°+sin²50°+sin10°sin50°的值详细答案

计算sin²1°+sin²2°+……+sin²89° 计算sin²10°+sin²50°+sin10°sin50°的值详细答案 sin²1°+sin²2°+sin²3°+.+sin²89 sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°+sin²90°=等于多少? 计算1-2sin²22.5 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 sin²1°+sin²2°+…+sin²88°+sin²89°= 求sin²1°+sin²2°+sin²3°……sin²89°=? sin²1°+sin²2°+……+sin²88°+sin²89°=? sin²1°+sin²2°+sin²3°+.+sin²89°= -1为什么? sin²1°+sin²2°+sin²3°.+sin²89°= sin²30°+2sin60°+tan45°+cos²30° 计算 sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°= 计算:sin方10°+sin方20°+sin方30°+sin方40°+sin方50°+sin方60°+sin方70°+sin方80°+sin方90°= 计算sin²25°+tan55°*tan35°+cos²25°-tan²30° 计算:sin²10°+sin²20°+sin²30°+.sin²80°= 计算:sin²10°+sin²20°+sin²30°+……sin²80°= 化简根号1-sin²（-40°）和根号1-2sinα10°cos10°/sin10°-根号1-sin²10°