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यदि ` y= sin x * cos 2x ` तो सिद्ध कीजिए की` " " (dy)/(dx) =y (cot x - 2tan 2x)` |
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Answer» ` (dy)/(dx )= (d)/(dx) (sin x cos 2x) =sin x (d)/(dx) (cos 2x )+ cos 2x (d)/(dx) (sin x ) " " =-sin x * 2sin 2 x+cos 2x cos x ` (सरल करने पर ) ` " "= y( (-2sin x sin 2x+ cosx cos2x )/(sin x cos 2x ))` |
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