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Solve the Problem θ\theta , the Water Level L Behind the Wheel Changes According

question 281

Essay

Solve the problem.
-A water wheel rotates through the angle θ\theta , the water level L behind the wheel changes according to the equation L=1sinθ2cos2θ\mathrm { L } = 1 - \sin \theta - 2 \cos ^ { 2 } \theta where L is measured in inches. Determine the values of θ\theta for which the water level is zero. Find the exact values.
Do not use a calculator.


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