用洛必达法则求以下极限(见图)lim [(e^x)-1/sin(5x)]x->0lim [1-cos(5x)/1-cos(7x)]x->0lim x->0 [(8^x-7^x-1)/(x^2)-1]lim [1-(6/x)]^x x->0 lim 7cos(3x)sec(9x)x->∞(搞错了~应该是>///<)lim [1-(6/x)]^x x->∞ lim 7cos(3x)sec(9x)x->pi/2