cos(π/4+a)=3/5,π/2≤a<3π/2,求(1-cos2a+sin2a)/1-tana的值?
问题描述:
cos(π/4+a)=3/5,π/2≤a<3π/2,求(1-cos2a+sin2a)/1-tana的值?
答
∵ π/2≤a