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Find all angles, 
0^(@) <= theta < 360^(@), that satisfy the equation below, to the nearest tenth of a degree.

cos^(2)theta-cos theta-12=0
Answer: 
theta=

Find all angles, 0^{\circ} \leq \theta<360^{\circ} , that satisfy the equation below, to the nearest tenth of a degree.\newlinecos2θcosθ12=0 \cos ^{2} \theta-\cos \theta-12=0 \newlineAnswer: θ= \theta=

Full solution

Q. Find all angles, 0θ<360 0^{\circ} \leq \theta<360^{\circ} , that satisfy the equation below, to the nearest tenth of a degree.\newlinecos2θcosθ12=0 \cos ^{2} \theta-\cos \theta-12=0 \newlineAnswer: θ= \theta=
  1. Solve Quadratic Equation: Let's first solve the quadratic equation in terms of cos(θ)\cos(\theta). The equation is cos2(θ)cos(θ)12=0\cos^2(\theta) - \cos(\theta) - 12 = 0. We can treat cos(θ)\cos(\theta) as a variable, say 'u', and rewrite the equation as u2u12=0u^2 - u - 12 = 0. Now we can factor this quadratic equation.
  2. Factor Quadratic Equation: To factor the quadratic equation u2u12=0u^2 - u - 12 = 0, we look for two numbers that multiply to 12-12 and add up to 1-1. These numbers are 4-4 and 33. So we can write the equation as (u4)(u+3)=0(u - 4)(u + 3) = 0.
  3. Identify Valid Solutions: Now we have two possible solutions for uu: u4=0u - 4 = 0 or u+3=0u + 3 = 0. Solving for uu gives us u=4u = 4 or u=3u = -3. However, since uu represents cos(θ)\cos(\theta) and the range of the cosine function is [1,1][-1, 1], u=4u = 4 is not a valid solution. Therefore, we only consider u=3u = -3, but again, this is outside the range of the cosine function, so there are no solutions in terms of cosine.
  4. Conclude No Solutions: Since there are no valid solutions for cos(θ)\cos(\theta) in the range [1,1][-1, 1], we conclude that there are no angles θ\theta between 00 and 360360 degrees that satisfy the original equation cos2(θ)cos(θ)12=0\cos^2(\theta) - \cos(\theta) - 12 = 0.

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