(7)d(secx)=sec x tan xdx, 8)d(esc x)== cot xd (9)d(a)=a'lnadx, (10)d(e=edx, (11)d(loga x) XIna (12)d(nx)(7) d sec sec tan d , ( x x x x ) = (8) d csc csc cot d , ( x x x x ) = − (9) d ln d , ( ) x x a a a x = (10) d e e d , ( ) x x = x ( ) 1 (11) d log d , ln a x x x a = ( ) 1 x x (12) d ln d , x =