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अन्तराल ((-pi)/(2),(pi)/(2)) में theta ...

अन्तराल `((-pi)/(2),(pi)/(2))` में `theta` के उन मानों की संख्या, जिनके लिये `theta!=(npi)/(5)` जहाँ `n=0,pm1,pm2` तथा `tan theta=cot 5theta` तथा `sin 2theta=cos 4theta` है, कितनी होगी

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