ͬÀí£ºÈôÊÓaΪÈÎÒâÖµ£¬²¢ÓÃx´ú»»£¬Ê¹µÃf(x)=cosx£¬¼´(sinx)=cosx¡£
×¢£ºÍ¬Àí¿ÉÖ¤£º(cosx)=-sinx¡£
¡¾Àý4¡¿ Çóf(x)=a(a0,a¡Ù1)µÄµ¼Êý¡£ x
f(x+h)-f(x)ax+h-axah-1x=lim=a?lim½â£ºf(x)=lim h¡ú0h¡ú0h¡ú0hhh
×¢£ºÌرðµØ£¬(e)=e¡£
¡¾Àý5¡¿ Çóf(x)=logaxxxx(a0,a¡Ù1)µÄµ¼Êý¡£ hloga(1+)loga(x+h)-logaxf(x+h)-f(x) ½â£ºf(x)=lim=lim=limh¡ú0h¡ú0h¡ú0hhh 1h11=lim?loga(1+)h=logae=¡£ h¡ú0xxxxlna x