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sec(90°-@)= cosec@ এটা সূত্র। অথবা এটা দেখেন: sec(90°-@) =1/{cos(90°-@)} =1/sin@ [cos(90°-@)=sin@] =cosec@
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sec(90°-@)= cosec@ এটা সূত্র। অথবা এটা দেখেন: sec(90°-@) =1/{cos(90°-@)} =1/sin@ [cos(90°-@)=sin@] =cosec@