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solve for A, A belongs to 0 to pie, cosAcos2Acos3A=1/4

Kindly refer the similar link for your query.
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https://www.meritnation.com/cbse/class11-science/textbook-solutions/math/rd-sharma-xi-(2016)/trigonometric-equations/page11.18-exercise-11.1-qno4/2152_10211_70817
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Sorry was lil' adjustments and untidiness. The answer is written in marked boundaries.
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