What is the value of $$tan^4A + tan^2A$$?
Expression :Â $$tan^4A + tan^2A$$
= $$tan^2 A(tan^2 A + 1)$$
Using $$(sec^2 A - tan^2 A) = 1$$
= $$(sec^2 A - 1) sec^2 A$$
= $$sec^4 A - sec^2 A$$
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