1) cos^2 A + sin^2 A = 12) tan^2 x + 1 = sec^2 x3) sec^2 θ - tan^2 θ = 14) 1 + cot^2 y = csc^2 y5) sin^2 (x) + cos^2 (x) = 16) tan^2 (α) + 1 = sec^2 (α)7) csc^2 (θ) - cot^2 (θ) = 18) 1 + cot^2 (β) = csc^2 (β)9) sin^2 (a) + 1 = csc^2 (a)10) cos^2 (b) - sin^2 (b) = 1
1) cos^2 A + sin^2 A = 1
2) tan^2 x + 1 = sec^2 x
3) sec^2 θ - tan^2 θ = 1
4) 1 + cot^2 y = csc^2 y
5) sin^2 (x) + cos^2 (x) = 1
6) tan^2 (α) + 1 = sec^2 (α)
7) csc^2 (θ) - cot^2 (θ) = 1
8) 1 + cot^2 (β) = csc^2 (β)
9) sin^2 (a) + 1 = csc^2 (a)
10) cos^2 (b) - sin^2 (b) = 1