请教1道三角函数数学题若sinX+cosX=tanX(0A (0,π/6) B (π/6,π/4) C (π/4,π/3) D ( π/3,π/2)
问题描述:
请教1道三角函数数学题
若sinX+cosX=tanX(0
A (0,π/6) B (π/6,π/4)
C (π/4,π/3) D ( π/3,π/2)
答
因为sinX+cosX=根号2*sin(x+π/4)