(а/2+3/5у)(3/5у-а/2)(3/5у+а/2)(3/5у-а/2)9/25у²-а²/4
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(а/2+3/5у)(3/5у-а/2)
(3/5у+а/2)(3/5у-а/2)
9/25у²-а²/4