23 Nov 2020 Question of the Day /Posted Bystephen/Comments0 Prove that the remainder $R_k$ in the Taylor series expansion of $\cos x$ at the point $a=0$ will converge for all values of $x$ in $\mathbb{R}$. https://mathsgrinds.ie/wp-content/uploads/2020/11/2020-11-02_21-30-45.mp4