Ononot — The Cauchy-Schwarz inequality states (a^2+b^2)(c^2+d^2) \geq

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The Cauchy-Schwarz inequality states $(a^2+b^2)(c^2+d^2) \geq (ac+bd)^2$ . Use it to find the minimum of $a^2+b^2$ given $3a+4b=25$ .