यदि \( \operatorname{cosec} A=\frac{5}{4} \) और \( A \) प्रथम चतुर्थांश में हैं, तो शेष त्रिकोणम...

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यदि \( \operatorname{cosec} A=\frac{5}{4} \) और \( A \) प्रथम चतुर्थांश में हैं, तो शेष त्रिकोणमितीय अनुपात ज्ञात कीजिए।
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