Question Number 207287 by rodrigue last updated on 10/May/24
Commented by rodrigue last updated on 10/May/24
$${need}\:{help}\:{here} \\ $$
Commented by mr W last updated on 11/May/24
$${obvious}\:{solution}: \\ $$$$\mathrm{cos}\:{x}=\mathrm{0}\:\Rightarrow{x}=\mathrm{2}{k}\pi\pm\frac{\pi}{\mathrm{2}} \\ $$$${other}\:{exact}\:{solutions}\:{are}\:{not}\:{possible}! \\ $$
Commented by rodrigue last updated on 11/May/24
yeah that what i was thinking of. thanks