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Which of the following is equivalent to (1+cos a) (1-cos a) for all values of a for which (1+cos a) (1-cos a) is defined? sin

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Which of the following is equivalent to (1+cos a) (1-cos a) for all values of a for which (1+cos a) (1-cos a) is defined? sin a sin a Select the correct answer below: secatan a O 1 O csca O cosa O sin a

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