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(sqrt2-sinalpha-cosalpha)/(sinalpha-cosa...

`(sqrt2-sinalpha-cosalpha)/(sinalpha-cosalpha)` is equal to (a)`sec(alpha/2-pi/8)` (b)`cos(pi/8-alpha/2)` (c)`tan(alpha/2-pi/8)` (d)`cot(alpha/2-pi/2)`

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