यदि \( \operatorname{cosec} \theta=\sqrt{2} \), तो \( \left(\tan ^{2} \theta-1\right) \) का मान ...

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यदि \( \operatorname{cosec} \theta=\sqrt{2} \), तो \( \left(\tan ^{2} \theta-1\right) \) का मान ज्ञात कीजिए।
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