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यदि alpha और beta न्यूनकोण हैं। और ...

यदि `alpha ` और `beta` न्यूनकोण हैं। और `cos 2alpha=(3 cos 2 beta-1)/( 3- cos 2 beta) ` तो सिध्द कीजिए कि:
` tan alpha= sqrt(2) tan beta`

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