f(x)=2sinxcosx+sinx+cosx+2如题,求f(x)值域
问题描述:
f(x)=2sinxcosx+sinx+cosx+2
如题,求f(x)值域
答
y=sinx+cosx+2sinxcosx+2
令a=sinx+cosx=√2sin(x+π/4)
所以-√2