3 Trigonometric Identities You Must Be Able To Derive From Scratch Derive the trigonometric identities below from absolute scratch... {cos(θ)}^2 + {sin(θ)}^2 = 1 1 + {tan(θ)}^2 = {sec(θ)}^2 {cot(θ)}^2 + 1 = {cosec(θ)}^2
