Question: Let G1 and G2 be context-free grammars, generating the languages L(G1) and L(G2), respectively. Show that there is a context-free grammar generating each of these

Let G1 and G2 be context-free grammars, generating the languages L(G1) and L(G2), respectively. Show that there is a context-free grammar generating each of these sets.
a) L(G1) ∪ L(G2)
b) L(G1)L(G2)
c) L(G1)*

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