求极限x^3*（cos x + sin x）/2^x,x趋于无穷

求极限x^3*（cos x + sin x）/2^x,x趋于无穷 求极限（sin （x -π/3))/(1-2cos x ) x (x+sin x)/(2x-cos x)当x趋近于无穷时求极限 (x+sin x)/(2x-cos x)当x趋近于无穷时求极限 求 lim(x→∞)[sin(2/x)+cos(1/x)]^x的极限. 求函数的极限lim((x→x/2)cosx)/(cos(x/2)-sin(x/2)) 求lim(sin x+cos x)/x 的极限 x趋于无穷 高数极限题,x->0的极限?f=x^2/(sqrt(1+x*sin(x))-sqrt(cos(x))); 4/3 求工程! 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? 如何求这个极限?(sin(1/x)+cos(1/x))的x次方当x->无穷时的极限. (1-sinx)/cos(x/2)-sin(x/2) x趋近π/2求极限 2sin^2x - 5sin x cos x=3 cos^2x,求X, cos x sin x=3,求cos x+sin x 数学达人帮助求极限!当x->0时sin(x)=x+o(x)x*cos(x)=x-x^3/2!+o(x^3)sin(x)^3=x^3+o(x)lim(sin(x)-x*cos(x)/sin(x)^3=1/2请问错在哪里?谢谢! 求极限lim(x-->0) (tanX-sinX)/[(sin^3)X] 1/cos(x) - tan(x) = 3 求sin(x)1/cos(x) - tan(x) = 3求sin(x) 大一高数问题,求极限x趋向于a时,求(sin x-sin a)/(x-a)的极限.答案是cos a, 当 x->0 ,且 x>0 时,求极限：lim ln(2*cos(x)+sin(1/x)) .