例22.y= In[ cos(10+3x2)],求y 解: cO(0+3x2)10+3x sin(10+3x2)(10+3x2) COs(10+3x2 6xtg(10+3x2)
结束 解 解 [cos(10 3 )] cos(10 3 ) 1 2 2 + + = x x y cos(10 3 ) sin(10 3 ) (10 3 ) 2 2 2 x x x + − + + = =−6xtg(10+3x 2 ) 例22 y=ln[cos(10+3x 2 )] 求y