pcosθ+psinθ=1等于pcos(θ-π/4)=根号2吗
问题描述:
pcosθ+psinθ=1等于pcos(θ-π/4)=根号2吗
答
pcosθ+psinθ=1
√2p(√2/2cosθ+√2/2sinθ)=1
即√2pcos(θ-π/4)=1≠pcos(θ-π/4)=根号2