sin²150°+sin²135°+2sin210°+cos²225°在线等
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sin²150°+sin²135°+2sin210°+cos²225°在线等sin²150°+sin²135°+2sin210°+cos²2
sin²150°+sin²135°+2sin210°+cos²225°在线等
sin²150°+sin²135°+2sin210°+cos²225°
在线等
sin²150°+sin²135°+2sin210°+cos²225°在线等
sin²150°+sin²135°+2sin210°+cos²225°
＝sin²30°+sin²45°-2sin30°+cos²45°
＝1/4+1/2-2*1/2+1/2
＝1/4
sin²150°+sin²135°+2sin210°+cos²225°
=1/4+1/2-2*1/2+1/2
=1/4
sin²1°+sin²2°+sin²3°+.+sin²89
sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°+sin²90°=等于多少?
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°=
计算sin²1°+sin²2°+……+sin²89°
sin²150°+sin²135°+2sin210°+cos²225°在线等
sin²150°+sin²135°+2sin210°+cos²225°的值
sin²1°+sin²2°+sin²3°+...+sin²88°+sin²89°=
求sin²1°＋sin²2°＋...＋sin²89°的值
sin²1°+sin²2°+sin²3°+…+sin²89°=?麻烦写下过程,
初三数学（三角函数1）1、求sin²1°+sin²2°+sin²3°+……+sin²89°的值.
∫sin²xdx
sin²15°-cos²15°等于多少
为什么sin²89°=cos²1°
cos²15°-sin²15°等于多少