1/2-sin^215°
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![1/2-sin^215°](/uploads/image/z/7076854-46-4.jpg?t=1%2F2-sin%5E215%C2%B0)
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1/2-sin^215°
1/2-sin^215°
1/2-sin^215°
因为:
所以:
原式=1/2-(2-√3)/4
=√3/4
sin^215°-1/2=1/2(1-cos30°)-1/2=1/2cos30°=√3/4
1/2-sin^215°
sin²1°+sin²2°+sin²3°+.+sin²89
sin^215°-1/2=
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°
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