求极限lim x→π/2 (1-sinx)/(cos^2)x

求极限lim x→π/2 (1-sinx)/(cos^2)x lim(x→∞)[(sinx)^2+x/cos^2x-x]求极限 求极限：lim(1/sinx^2x-(cos^2x)/x^2) X趋于0 求极限lim(1-cos(1-cosX))/(sinx^2*ln(1+x^2))有图. 利用lim sinx/x =1或等价无穷小量求极限 lim (cosαx-cosβx)/x^2 x趋向0 求极限 lim x→∞（2sinx/x-） 求lim(x→0+） ( 2/π*cosπ/2(1-x))/x的极限 求极限lim{[(sinx)/x]+xsin(1/2x)} 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 求 lim(x→∞)[sin(2/x)+cos(1/x)]^x的极限. 求极限lim(x→0)e^x-x-1/sinx^2 求极限 lim/x-0 (e^x+sinx+x^2)