二分之根号二cos(a)＋二分之根号二sin(a)等于…郁闷,
问题描述：
二分之根号二cos(a)＋二分之根号二sin(a)等于
…郁闷,
答
√2 cos(a)/2+ √2sin(a) /2=sinπ/4 cos(a)+cosπ/4 sin(a)=sin(a+π/4).
二分之根号二cos(a)＋二分之根号二sin(a)等于
…郁闷,
√2 cos(a)/2+ √2sin(a) /2=sinπ/4 cos(a)+cosπ/4 sin(a)=sin(a+π/4).