[" 48.What is "],[qquad [(1+tan alpha ta...

[" 48.What is "],[qquad [(1+tan alpha tan beta)^(2)+(tan alpha-tan beta)^(2)-],[sec^(2)alpha sec^(2)beta]],[" equal to ? "],[[" (a) "0],[" (b) "1],[" (c) "2],[" (d) "4]]

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