y=(1/4)^x-(1/2)^x+6.求当x属于【-3,4】时y的值域.注(^x)是x为右上角的方
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y=(1/4)^x-(1/2)^x+6.求当x属于【-3,4】时y的值域.注(^x)是x为右上角的方
y=(1/4)^x-(1/2)^x+6.求当x属于【-3,4】时y的值域.
注(^x)是x为右上角的方
y=(1/4)^x-(1/2)^x+6.求当x属于【-3,4】时y的值域.注(^x)是x为右上角的方
令a=(1/2)^x,则(1/4)^x=a²
-3
y=2cos(π/3+x)+2cosx
=4sin(x+π/6)cosπ/6
=2√3sin(x+π/6)
x属于[π/3,5π/6),x+π/6属于[π/2,π),
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