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)(1)/(2^(2k)) sec^(2) ((x)/(2^(k))) equals

Answer»

`COSEC^(2) X - (1)/(x^(2))`
`cosec^(2) x + (1)/(x^(2))`
`cosec^(2) x - x^(2)`
`cosec^(2) x+ x^(2)`

ANSWER :A


Discussion

No Comment Found

Related InterviewSolutions