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यदि sec A =(5)/(4) , तो प्रदर्शित कीजिए ...

यदि sec A =(5)/(4) , तो प्रदर्शित कीजिए कि (3 sin A -4 sin^(3)A)/(4 cos^(3)a -3 cosA )=(3 tan A ...

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