化简sin(π/4-α)+cos(π/4+α)
问题描述：
化简sin(π/4-α)+cos(π/4+α)
答
sin(π/4-α)+cos(π/4+α)
=sin(π/4-α)+cos[π/2-(π/4-α)]
=sin(π/4-α)+sin(π/4-α)
=2sin(π/4-α)