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4. Perform the following operations. (tan x + sec x ) (tanx - secx) b) (sin2 0 + cos2 0)2 sin a 1+cosa d) +

4. Perform the following operations. (tan x + sec x ) (tanx - secx) b) (sin2 0 + cos2 0)2 sin a 1+cosa d) + 1+cos a sin a

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