已知sin2x+cos2x>0 ,那么x的取值范围是?写下具体步骤 x是实数······
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![已知sin2x+cos2x>0 ,那么x的取值范围是?写下具体步骤 x是实数······](/uploads/image/z/4208253-69-3.jpg?t=%E5%B7%B2%E7%9F%A5sin2x%2Bcos2x%3E0+%2C%E9%82%A3%E4%B9%88x%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%3F%E5%86%99%E4%B8%8B%E5%85%B7%E4%BD%93%E6%AD%A5%E9%AA%A4+x%E6%98%AF%E5%AE%9E%E6%95%B0%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7)
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已知sin2x+cos2x>0 ,那么x的取值范围是?写下具体步骤 x是实数······
已知sin2x+cos2x>0 ,那么x的取值范围是?
写下具体步骤 x是实数······
已知sin2x+cos2x>0 ,那么x的取值范围是?写下具体步骤 x是实数······
sin2x+cos2x=√2sin(2x-π/4)>0
2kπ<2x-π/4<2kπ+π
kπ+π/8
原式=2^0.5sin(2x+π/4),所以值域为2^0.5到2^-0.5