he values of O between 0° and 360° ...
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he values of O between 0° and 360° which satisfy the equations 15. Find the values (11) COS 30 (i) sin? 0 = ISC

JEE/Engineering Exams
Maths
Solution
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( begin{aligned} text { (1) } cos 3 theta &=frac{1}{2} & text { =) } 3 theta=60^{circ}, 300^{circ} & Rightarrow Q=20^{circ}, 100^{circ} end{aligned} ) (1) ( sin ^{2} theta=3 ) ( Rightarrow sin ^{0}=pm frac{3}{2} ) ( Rightarrow theta=60^{circ}, 120^{circ}, 240^{circ}, 300^{circ} )
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