3 years ago

R(r1+r2) = r1r2, For r2

1 answer:

8 0

$R(r_1+r_2)=r_1r_2\\
Rr_1+Rr_2=r_1r_2\\
Rr_2-r_1r_2=-Rr_1\\
r_2(R-r_1)=-Rr_1\\
r_2=-\dfrac{Rr_1}{R-r_1}
$

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