1.

We have f (x) lim_(n to oo)cos (x)/(2) cos (x)/(2^(2)) cos (x)/(2^(3)) cos (x)/(2^(4))…… ….cos (x)/(2^(n)) = ("sin" x)/(2^(n) "sin" (x)/(2^(n))) using the identity lim_(n to oo)sum_(k=1)^(n)tan ((x)/(2^(k))) equals

Answer»

`(1)/(x - TAN x`
`(1)/(x) - COT x`
`x + cot x`
`x + tan x`

ANSWER :B


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