If alpha is the root of 25 cos^2 theta + 5 Cos theta ......
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25 Cos² θ + 5 Cos θ = 0
Cos α = 0 or 5 Cos α + 1 = 0
alpha = α = (2 n + 1) π/2 , n = an integer
or,
α = π - Cos⁻¹ (1/5) or π + Cos⁻¹ (1/5)
α = (2 n+1) π - Cos⁻¹ (1/5) or (2n+1) π + Cos⁻¹ (1/5)
Cos α = 0 or 5 Cos α + 1 = 0
alpha = α = (2 n + 1) π/2 , n = an integer
or,
α = π - Cos⁻¹ (1/5) or π + Cos⁻¹ (1/5)
α = (2 n+1) π - Cos⁻¹ (1/5) or (2n+1) π + Cos⁻¹ (1/5)
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