Question Number 108757 by bemath last updated on 19/Aug/20
$$\:\:\frac{\vdots\mathcal{B}{e}\mathcal{M}{ath}\vdots}{\triangleright\heartsuit\triangleleft} \\ $$$$\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\frac{\mathrm{1}−\sqrt{\mathrm{cos}\:{x}\mathrm{cos}\:\mathrm{2}{x}\mathrm{cos}\:\mathrm{3}{x}\mathrm{cos}\:\mathrm{4}{x}…\mathrm{cos}\:{nx}}}{{x}^{\mathrm{2}} }\:=? \\ $$
Answered by bemath last updated on 19/Aug/20
