$\cos^{2}\left(θ\right) + \sin^{2}\left(θ\right)$ 

$1-\cos^2(θ)$ 

$1-\cos^2\left(5\right)$ 

$1-\sin^2\left(β\right)$ 

$1-\sin^2\left(3δ\right)$ 

$4-4\sin^2\left(3δ\right)$