98 



PRACTICAL MATHEMATICS 



(21) e M tan nx sec nx 

 ax 2 + bx + c 



(22) 



(39) 



I-x 2 



(41) log e x tan" 1 a? 

 (43) tan x sin- 1 a? 



X 6 







sin x 



(40) x tan- 1 a; 



(42) as log, (tan- 1 x) 

 (44) tan" 1 x sec # 



(54) sin 



