cos²﹙∏／4-α﹚+cos²﹙∏／4＋α﹚的值?

来源：学生作业帮助网编辑：作业帮时间：2024/04/30 06:47:38

cos²﹙∏／4-α﹚+cos²﹙∏／4＋α﹚的值?
cos²﹙∏／4-α﹚+cos²﹙∏／4＋α﹚的值?

cos²﹙∏／4-α﹚+cos²﹙∏／4＋α﹚的值?
cos²﹙∏／4-α﹚+cos²﹙∏／4＋α﹚
=sin²﹙∏／4+α﹚+cos²﹙∏／4＋α﹚
=1

cos²﹙∏／4-α﹚+cos²﹙∏／4＋α﹚
=sin²(π/2-(π/4-α)]+cos²(π/4+α)
=sin²(π/4+α)+cos²(π/4+α)
=1