442 PRACTICAL MATHEMATICS 



dp 1-5 0-2 



When t = 5-3 0-1 - = 6-5 + - + - 



also 



dt 



= 116-7 



0-1 - 13-8 -*- 



01 - 138 ~ + 



= 116-7 



Expressing the angle in radians, 

 d0 116-7TC 



= 2-036 



and 



dt 180 



_^ = 25-2x2-036 



OT 



= 51-33 



