d^2ca=b^4c^3a^2

and

d^3a^2=b^2dc^4

since we need to solve for " a " then arrange all others on one side

d^2c/(b^4c^3) =a^2/a

therefore a = d^2/(b^4c^2) Answer

2. d^3 a^2=b^2 d c^4

a^2=b^2 d c^4/d^3

or we can write , a^2=b^2 c^4/d^2

taking square root we get , a = bc^2/d Answer

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