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If 2sec^2A-sec^4A-2cos e c^2A+cos e c^4A...

If `2sec^2A-sec^4A-2cos e c^2A+cos e c^4A=(15)/4,t h e n` tan A is equal `1//sqrt(2)` (b) `1/2` (c) `1/2sqrt(2)` (d) `-1/(sqrt(2))`

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