Position from polar velocity A particle P starts at time t 0s at the position 
 x=3 m 
 y=-4 m. 
 The velocity v of the particle is written in the polar basis associated with its current position, and is: 
 vi -2sin(2t)ês m/s
 In the above expression, t is in seconds. 
 Matlab/Mathematica input: 
 x0=3
 y0=-4 
 What is the position of P att-4 s?