Calculus - Sequences and series, tests of convergence.
Use the root test to show that a geometric series converges only if its ration has absolute value less than 1, or its initial term is 0.
Calculus - Sequences and series, tests of convergence.
Use Taylor's formula for f(x) = cos x.
= - (x- x/2) + 1/3! (x - x/2)3 - 1/5! (x- x/2)5 + ..............
To estimate cos 800 with an error less than 0.0001.