1.sin²40°+sin²50°等于多少
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1.sin²40°+sin²50°等于多少
1.sin²40°+sin²50°等于多少,2.如何证明sin(30°+α)=cos(60°-α)
1.sin²40°+sin²50°等于多少,2.如何证明sin(30°+α)=cos(60°-α)
![1.sin²40°+sin²50°等于多少](/uploads/image/z/17061634-10-4.jpg?t=1.sin%26%23178%3B40%C2%B0%2Bsin%26%23178%3B50%C2%B0%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
1.sin²40°+sin²50°
sin²40°+sin²50°
=sin²40°+cos²(90°-50°)
=sin²40°+cos²40°
=1
2.如何证明sin(30°+α)=cos(60°-α)
sin(30°+α)
=cos[90°-(30°+α)]
=cos(60°-α)
sin²40°+sin²50°
=sin²40°+cos²(90°-50°)
=sin²40°+cos²40°
=1
2.如何证明sin(30°+α)=cos(60°-α)
sin(30°+α)
=cos[90°-(30°+α)]
=cos(60°-α)
已知sin (30°) = 0.5,sin (45°) = 0.707,sin (40°)利用线性插值计算等于多少?
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