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A in (0, (pi)/(4)) के लिए, यदि (1 + (cos...

`A in (0, (pi)/(4))` के लिए, यदि `(1 + (cos 3A)/(cos A)) + (1 + (cos 6A)/(cos 2A)) + (1 + (cos 9A)/(cos 3A)) + (1 + (cos 12 A)/(cos 4A)) = 0` है, तो `(cosec A - sec 2A)` का मान ज्ञात कीजिए |

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