Question

cosθ/(1+cosθ)=-4,且(1/2)^sinθ>1,求tan(θ/2)

Answer 1

cosθ/(1+cosθ)=-4

cosθ=-4-4cosθ

5cosθ=-4

cosθ=-4/5

因为(1/2)^sinθ>1

(1/2)^sinθ>(1/2)^0

sinθ