Ts Eamcet
Trigonometric Ratios And Identities
TS EAMCET 2020 (Online) 14th September Morning Shift
MCQ+1 / -02020
For $n \in \mathbf{N}$, if $f(n)=(\cos n x)(\sec x)^n$ and $g(n)=(\sin n x)(\sec x)^n$, then $f(2020)-f(2019)+(\tan x) g(2019)=$
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