Find alpha ^-1 +beta^-1 +gamma^-1
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(alpha*beta + beta*gamma + gamma*alpha)/alpha*beta*gamma
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we have
alpha-¹+ beta-¹+Gama -¹
1/alpha+1/beta+1/gamma
beta*gamma+ gamma*alpha+alpha*beta/alpha*beta*gamma
alpha-¹+ beta-¹+Gama -¹
1/alpha+1/beta+1/gamma
beta*gamma+ gamma*alpha+alpha*beta/alpha*beta*gamma
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