Question Number 23718 by vick007 last updated on 05/Nov/17
$$\mathrm{5}\left(\mathrm{tan}^{\mathrm{2}} {x}−\mathrm{cos}^{\mathrm{2}} {x}\right)=\mathrm{2}{cosx}+{a}\:{then}\:{find} \\ $$$${then}\:{find}\:{the}\:{value}\:{of}\:{cos}\mathrm{4}{x}.??? \\ $$
Commented by vick007 last updated on 04/Nov/17
$${please}\:{ans}\:{me}\:{soon}... \\ $$