1.5=1/cos(x) find x
1cos(x)=1.51cos(x)=32cos(x)=23cos(x)=23|±arccos()x=±arccos(23)x1,2=±48.1896851042\ensurement∘x1=48.1896851042\ensurement∘x2=−48.1896851042\ensurement∘x2=−48.1896851042\ensurement∘+360\ensurement∘x2=311.810314896\ensurement∘