kπ+π/4
kπ+π/4
求值tan(kπ+π/6)cos(kπ-4π/3),k属于z
下列终边相同的角是【选择题.】A.kπ+π/2与k*90°,k∈ZB.(2k+1)π与(4k±1)π,k∈ZC.kπ+π/6与2kπ±π/6,k∈ZD.(kπ)/3与kπ+(π/3),k∈Z
编一个程序求π的近似值#include void main(void){double x,y,k=1;while (y>=1e-6){ if(k>0){x=4*1/k+x;y=1/k;k=(k+2)*(-1);}else{k=k*(-1);x=4*1/k*(-1)+x;y=1/(k*(-1));}}cout
(2kπ+π)/4和(kπ+2π)/4哪个大?为什么?k是整数
不等式tanx≦-1的解集是选项:A.(2kπ-π/2,2kπ-π/4](k∈Z) B.[2kπ-π/4,2kπ+3π/2](k∈Z)C.(kπ-π/2,kπ-π/4](k∈Z) D.[2kπ+π/2,2kπ+3π/4](k∈Z)
函数y=根号2sin(x+π/4)+1的定义域为什么?A.[2kπ-5π/12,2kπ+11π/12]k∈zB.[kπ-5π/12,kπ+11π/12]k∈zC[2kπ-11π/12,2kπ+5π/12]k∈zD[kπ-11π/12,kπ+5π/12]k∈z
kπ+ π 4 ≤x
当2kπ-π/4
函数y=lg(sinxcosx)的单调递减区间是?A.(kπ-π/4,kπ+π/4) B.(kπ+π/4,kπ+π/2)C.(2kπ-π/4,2kπ+π/2) D.(kπ-π/4,kπ) (k∈Z)
2kπ+π
化简cos[(4k+1)π/4+x]+cos[(4k-1)π/4-x]k属于Z
化简 sin(4k-1/4π- α)+cos(4k+1/4π -α)(k∈Z)
1.化简:sin(4k-1/4π -a)+cos(4k+1/4π -a)(k∈Z)
化简sin(4k-1/4π- α)+cos(4k+1/4π -α)(k∈Z)
答案(kπ+π/4,kπ+π/2)k∈Z还是必须{x|kπ+π/4问题是问定义域,区间与集合有啥区别
sin( α+kπ)=cos(α+π+kπ),则α的值是?答案是kπ+3/4π (k是整数)
平行板电容器公式中K是什么,大小是多少?ε=1/4πk这里的k就是上面的k吗?