sinα = y / √(2² + y²) = 4/5怎么算
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sinα = y / √(2² + y²) = 4/5怎么算
sinα = y / √(2² + y²) = 4/5怎么算
sinα = y / √(2² + y²) = 4/5怎么算
y / √(2² + y²) = 4/5
y²=16/25×(2² + y²)
(9/25)y²=64/25
y²=64/25×25/9=64/9
y=±8/3