Q. Find all angles, 0∘≤θ<360∘, that satisfy the equation below, to the nearest tenth of a degree.2sin2θ−2sinθ=−3sinθ+1Answer: θ=
Rewrite Equation: Rewrite the given equation to collect like terms on one side.2sin2(θ)−2sin(θ)+3sin(θ)−1=0
Simplify Equation: Simplify the equation by combining like terms. 2sin2(θ)+sin(θ)−1=0
Factor Quadratic: Factor the quadratic equation in terms of sin(θ).$2sin(θ)−1)(sin(θ)+1)=0
Set Factors Equal: Set each factor equal to zero to find the values of sin(θ).2sin(θ)−1=0 or sin(θ)+1=0
Solve for sin(θ): Solve each equation for sin(θ). For 2sin(θ)−1=0: sin(θ)=21 For sin(θ)+1=0: sin(θ)=−1
Find sin(θ)=21: Find the angles θ that correspond to sin(θ)=21 between 0 degrees and 360 degrees.sin(θ)=21 at θ=30 degrees and θ=150 degrees.
Find sin(θ)=−1: Find the angles θ that correspond to sin(θ)=−1 between 0 degrees and 360 degrees.sin(θ)=−1 at θ=270 degrees.
Combine Solutions: Combine the solutions from steps 6 and 7 to list all the angles that satisfy the original equation. θ=30 degrees, 150 degrees, and 270 degrees.
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