k) 1+tan 4A. tan 2A = sec 4A
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Step-by-step explanation:
to prove 1+tan 4A. tan 2A = sec 4A
LHS = 1+tan 4A. tan 2A
= 1 + *
=
=
=
=
= sec4A
= RHS
=> LHS = RHS
Hence proved
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