How is a "series" different than a "sequence"?

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Which statement about the relative areas of δabc and δxyz is true? the area of δabc > the area of δxyz the area of δabc < the area of δxyz the area of δabc = the area of δxyz more information is needed to compare.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).