1.sin^2(1°)+sin^2(2°)+sin^2(3°)+……+sin^2(89°)+sin^2(90°).2.已知tanα100°=k,则sin80°=_______?3.已知α是锐角,2tan(π-α)-3cos(π/2+β)+5=0,tan(π+α)+6sin(π+β)-1=0.则sinα=______?

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/16 17:11:36
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sin²1°+sin²2°+sin²3°+.+sin²89 计算：sin²1°+sin²2°+sin²3°...+sin²45°+sin²46°...+sin²89° 计算：sin²1°+sin²2°+sin²3°+...+sin²87°+sin²88°+sin²89° sin²1°+sin²2°+sin²3°+……+sin²87°+sin²88°+sin²89°= sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°+sin²90°=等于多少? 1-2sin 22.5° 1/2-sin^215° sin²1°+sin²2°+sin²3°+.+sin²89°= -1为什么? sin²1°+sin²2°+sin²3°……sin²89°=? sin²1°+sin²2°+sin²3°……sin²89°= sin²1°+sin²2°+.+sin²89°+sin²90°=? sin²1°+sin²2°+sin²3°…+sin²89°的值是多少 求值:sin²1°+sin²2°+...+sin²89°+sin²90°= sin²1°+sin²2°+……sin²88°+sin²89° sin²1°+sin²2°+sin²3°+...+sin²90°的值 sin²1°+sin²2°+…+sin²88°+sin²89°= sin²1°+sin²2°+sin²3°+...+sin²90°等于多少?要解析 求sin²1°+sin²2°+sin²3°……sin²89°=?