Respuesta :

ghanami

Answer:

sin2θ - cos2θ = 2sin² θ

Step-by-step explanation:

hello :

tan θ = 1    means : sinθ /cosθ   so : sinθ =cosθ

sin2θ = 2sin θ  cosθ  =2sin² θ

cos2θ = cos²θ - sin²θ = sin²θ - sin²θ =0

sin2θ - cos2θ = 2sin² θ