Prove that:

cot θ + tan θ = cosec θ sec θ

6

Prove that:

6

Prove that:

(sec θ – cos θ) (cot θ + tan θ) = tan θ sec θ

6

Prove that:

6

Prove that:

sin⁴ θ – cos⁴ θ = 1 – 2cos² θ