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INFO:
If(secβ+tanβ)(secγ+tanγ) =tanαtanβtanγ, then (secα-tanα)(secγ-tanγ) is equal to(a) cotαcotβcotγ(b) tanαtanβtanγ(c) cotα+cotβ+cotγ(d) tanα+tanβ+tanγ