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EX10. Find the value of tan + tan (cot A) + tan' (cot'A). for 0 < A EX11. Ifx +y +? =r?, then tan

EX10. Find the value of tan + tan (cot A) + tan' (cot'A). for 0 < A EX11. Ifx +y +? =r?, then tan" |+ tan tan is equal to . 0 d none of these 2

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