lim-x-pi-picos2x-1-1-cosx-

Question Number 169148 by mathlove last updated on 25/Apr/22

\lim_{x \to π} \frac{π c o s 2 x - 1}{1 + c o s x} = ?

Commented by infinityaction last updated on 25/Apr/22

p = \frac{π \cos 2 π - 1}{1 + \cos π}

p = \frac{π \times 1 - 1}{1 - 1} = \frac{π - 1}{0} = \infty

Commented by mathlove last updated on 25/Apr/22

w a y π c o s 2 x - 1 \neq π (c o s 2 x - 1)