1+ cos theetha + sintheetha / cos theetha - sin theetha -1 = 1+sintheetha / cos theetha

The scatter plot graph shows the average annual income for a certain profession based on the number of years of experience which of the following is most likely to be the equation of the trend line for this set of data? a. i=5350e +37100 b. i=5350e-37100 c. i=5350e d. e=5350e+37100

Could somebody me with this radical simplification?

How can you find the magnitude of a vector, v = < x, y > , where the horizontal change is x and the vertical change is y?