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(i) \( \sin 2 x \geq-\tan x \) Toon aan dat \( 2 \cos \theta=\sin \left(\theta+30^{\circ}\right) \) geskryf kan word as \( \sqrt{3} \sin \theta=3 \cos \theta \) Los vervolgens die vergelyking \( 2 \cos \theta=\sin \left(\theta+30^{\circ}\right) \) op vir \( \theta \in\left[-180^{\circ} ; 180^{\circ}\right] \). Teken die grafieke van die volgende funksies op diesclfde assestelsel \( f(\theta)=2 \cos \theta \) en \( g(\theta)=\sin \left(\theta+30^{\circ}\right) \) vir \( \theta \in\left[-180^{\circ}\right. \). 1 ( \( \theta \).

Ask by Ortiz Norris. in South Africa
Mar 13,2025

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Answer

The solutions to the equation \( 2 \cos \theta = \sin(\theta + 30^\circ) \) in the interval \( [-180^\circ, 180^\circ] \) are: - \( \theta = 60^\circ \) - \( \theta = -120^\circ \) To visualize these solutions, plot the functions \( f(\theta) = 2 \cos \theta \) and \( g(\theta) = \sin(\theta + 30^\circ) \) on the same graph for \( \theta \) from \(-180^\circ\) to \(180^\circ\). The points where the two graphs intersect correspond to the solutions \( \theta = 60^\circ \) and \( \theta = -120^\circ \).

Solution

It seems that I am unable to plot the functions directly. However, I can guide you on how to plot the functions \( f(\theta) = 2 \cos \theta \) and \( g(\theta) = \sin(\theta + 30^\circ) \) using a graphing tool or software. ### Instructions for Plotting 1. **Choose a Graphing Tool**: You can use graphing calculators, software like Desmos, GeoGebra, or even Python with libraries like Matplotlib. 2. **Set the Range**: Make sure to set the x-axis (representing \( \theta \)) from \(-180^\circ\) to \(180^\circ\). 3. **Plot the Functions**: - For \( f(\theta) = 2 \cos \theta \): - Input the function \( y = 2 \cos(x) \) where \( x \) is in degrees. - For \( g(\theta) = \sin(\theta + 30^\circ) \): - Input the function \( y = \sin(x + 30) \) where \( x \) is in degrees. 4. **Label the Axes**: Label the x-axis as \( \theta \) and the y-axis as the function values. 5. **Identify Intersections**: Look for points where the two graphs intersect, which correspond to the solutions of the equation \( 2 \cos \theta = \sin(\theta + 30^\circ) \). ### Summary of Solutions The solutions to the equation \( 2 \cos \theta = \sin(\theta + 30^\circ) \) in the interval \( [-180^\circ, 180^\circ] \) are: - \( \theta = 60^\circ \) - \( \theta = -120^\circ \) If you have any further questions or need additional assistance, feel free to ask!

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Bonus Knowledge

Noudat ons die vergelyking \( 2\cos \theta = \sin(\theta + 30^\circ) \) het, kan ons dit herskryf. Deur die identiteite op te volg, sien ons dat \( 2\cos \theta = \sqrt{3} \sin \theta - 3\cos \theta \), wat maklik gevisualiseer kan word op 'n grafiek. Hierdie identiteit help ons om die faseverskuiwing te oefen, omdat die sinusfunksie 'n verskuiwing het wat die grafiek baie interessant maak. Wat die oplossing van die vergelyking betref, kan ons die beide funksies op dieselfde assestelsel teken om hul snypunte visueel te identifiseer. Wanneer jy \( f(\theta) \) en \( g(\theta) \) op 'n grafiek teken tussen \( [-180^\circ, 180^\circ] \), sal jy die punte vind waar die twee grafieke mekaar kruis, wat die oplossings vir die vergelyking verteenwoordig. Gebruik 'n grafiekprogram of eenvoudige handtekening om hierdie punte op te spoor – dit is 'n prettige manier om met trigonometriese funksies te werk!

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