Докажите тождество(Пожалуйста, с подробным решением)
[tex] \frac{b}{a-b} - \frac{a ^{2} - b^{2} }{a+3b} * ( \frac{a+b}{(a-b)^2} + \frac{b}{a^2-b^2} ) = -1[/tex]
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