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[" 3.If "A+B=90^(@)," then "(tan A tan B...

[" 3.If "A+B=90^(@)," then "(tan A tan B+tan A cot B)/(sin A sec B)-(sin^(2)B)/(cos^(2)A)" is equal to "],[[" (a) "cot^(2)A," (b) "cot^(2)B," (c) "-tan^(2)A," (d) "-cot^(2)A]]

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