设cos(π/4+x)=3/5,x∈(3π/4,7π/4),求(sin2x+2sin²x)/(1-tanx)
问题描述:
设cos(π/4+x)=3/5,x∈(3π/4,7π/4),求(sin2x+2sin²x)/(1-tanx)
答
3π/4
设cos(π/4+x)=3/5,x∈(3π/4,7π/4),求(sin2x+2sin²x)/(1-tanx)
3π/4