f(x)=2cosx^2 + 2根号3sinxcosx +a
=cos2x + 根号3 sin2x +a +1
=2sin(2x+派/6) +a+1 a=1
x属于[0.pai/2]
x=pai/6 取最大值 f(x)=4
x=pia/2 取最小值 f(x)=1
f(x)=2cosx^2 + 2根号3sinxcosx +a
=cos2x + 根号3 sin2x +a +1
=2sin(2x+派/6) +a+1 a=1
x属于[0.pai/2]
x=pai/6 取最大值 f(x)=4
x=pia/2 取最小值 f(x)=1