已知0<a<π/2,且sina=4/5.求cos2a的值.求tan(a-5π/4)值
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已知0<a<π/2,且sina=4/5.求cos2a的值.求tan(a-5π/4)值
已知0<a<π/2,且sina=4/5.求cos2a的值.求tan(a-5π/4)值
已知0<a<π/2,且sina=4/5.求cos2a的值.求tan(a-5π/4)值
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