range of function f(x)= 6^x+3^x+6^-x+3^-x+2?a.[-2,infinity) b.(-2,infinity) c.(6,infinity) d.[6,infinity)
range of function f(x)= 6^x+3^x+6^-x+3^-x+2?
a.[-2,infinity) b.(-2,infinity) c.(6,infinity) d.[6,infinity)
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