Q. Find all solutions with 0∘≤θ≤180∘. Give the exact answer(s) in simplest form. If there are multiple answers, separate them with commas.cos(θ)=21____∘
Identify cos(θ)=21: Recognize that cos(θ)=21 corresponds to angles where the x-coordinate of the point on the unit circle is 21. This happens at 60∘ and its supplementary angle.
Calculate Supplementary Angle: Calculate the supplementary angle of 60°, which is 180°−60°=120°.
List Angles for cos(θ)=21: List the two angles where cos(θ)=21 within the given range: 60∘ and 120∘.
More problems from Solve trigonometric equations II