$(1).\,\,$ Factorize $x^4+64$
$(2).\,\,$ Factorize $x^4+x^2+1$
$(3).\,\,$ Factorize $x^2-16$
$(4).\,\,$ Factorize $64x^2-121y^2$
$(5).\,\,$ Factorize $16a^4-81b^4$
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