Question

Prove that :

((sin⁴ θ + cos⁴ θ)/(1 - 2sin² θ cos² θ)) = 1

Answer 1

((sin⁴ θ + cos⁴ θ)/(1 - 2sin² θ cos² θ)) 

Comments

Pleased explain which identity you have applied

---

We used a^2+b^2 = (a+b)^2 -2ab and trigonometric identity is sin^2 \theta +cos^2 \theta = 1