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. 4 cos2 θ = 2

b. 3 tan2 θ + tan θ = 0

c. cos2 θ − 2 cos θ = 3

d. 2 sin2 2θ − 5 cos 2θ = −2

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