Question: Solve the following equations for , in the interval 0 < < 2, giving your answers to 3 significant figures where they are not

Solve the following equations for θ, in the interval 0 < θ < 2π, giving your answers to 3 significant figures where they are not exact.

a. Cos θ + 2 sin2 θ + 1 = 0

b. 10 sin2 θ = 3 cos2 θ

c. 4 cos2 θ + 8 sin2 θ = 2 sin2 θ − 2 cos2 θ

d. 2 sin2 θ − 7 + 12 cos θ = 0

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