计算定积分∫_0^2▒〖x^2〗√a^2-x^2 ,dx(a>0)

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计算定积分∫_0^2▒〖x^2〗√a^2-x^2,dx(a>0)计算定积分∫_0^2▒〖x^2〗√a^2-x^2,dx(a>0)计算定积分∫_0^2▒〖x^2〗√a

计算定积分∫_0^2▒〖x^2〗√a^2-x^2 ,dx(a>0)
计算定积分∫_0^2▒〖x^2〗√a^2-x^2 ,dx(a>0)

计算定积分∫_0^2▒〖x^2〗√a^2-x^2 ,dx(a>0)
▒是什么……