sin^2(theta) + cos(theta) = 1

sin^2 θ + cosθ = 1

1 - cos^2 θ + cosθ = 1

cosθ - cos^2 θ = 0

cosθ(1 - cosθ) = 0

cosθ = 0 , 1 - cosθ = 0

θ = π/2, 3π/2 cosθ = 1

θ = 0

Hence θ = 0 , π/2 , 3π/2

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