Solve each equation for 0 < < 180. a. sec = 3cos tan b. sec

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Solve each equation for 0° < θ <180°.
a. secθ = 3cosθ − tanθ

b. sec22θ = 3tanθ +1

c. sec4 θ + 2tan2θ

d. 2 cot2θ + 7 cosec 2θ = 2

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