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[" (19) Universal "cosec^(2)A=1+cot^(2)A...

[" (19) Universal "cosec^(2)A=1+cot^(2)A" By applying "],[qquad (cos A-sin A+1)/(cos A+sin A-1)=cosec A+cot A[" (बोर्ड Sample "2019]]

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