函数y=sin(Inx)+cos(Inx)=?
问题描述：
函数y=sin(Inx)+cos(Inx)=?
答
=([cos(lnx)]-[sin(lnx)])/x
答
y=f(x)=sin(Inx)+cos(Inx)=?令t=lnx y=f(t)=sint+cost=√2sin(t+π/4)即 y=√2sin(lnx+π/4)