Question Number 78887 by gopikrishnan last updated on 21/Jan/20
$${if}\:{teta}=\mathrm{tan}^{−\mathrm{1}} \left(\mathrm{7}\right)\:{then}\:\mathrm{sec}\:{teta}\:{is} \\ $$
Commented by jagoll last updated on 21/Jan/20
$$\mathrm{tan}\:\left(\theta\right)\:=\:\mathrm{7} \\ $$$$\mathrm{you}\:\mathrm{need}\:\mathrm{sec}\:\left(\theta\right) \\ $$$$\mathrm{sec}\:\left(\theta\right)=\:\pm\sqrt{\mathrm{1}+\mathrm{tan}\:^{\mathrm{2}} \left(\theta\right)} \\ $$
Commented by jagoll last updated on 21/Jan/20
$$\mathrm{sec}\:\left(\theta\right)\:=\:\pm\:\mathrm{5}\sqrt{\mathrm{2}} \\ $$