Question

设函数f(θ)=|向量a+向量b|,其中向量a=（sinθ,1),向量b=(1,cosθ),-π/2

Answer 1

f(θ)=√[(1+sinθ)^2+(1+cosθ)^2]

=√(3+2sinθ+2cosθ)

=√(3+2√2 sin(θ+π/4))

由 -π/2