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[" 31."(4fa)/(a)x+y+z=pi,tan x tan z=2" ...

[" 31."(4fa)/(a)x+y+z=pi,tan x tan z=2" site tan "y tan z=18],[(1)/(8)(pi)/(pi)sqrt(a)tan^(2)z(pi)/(9 pi)(tan x)/(3 pi)(tan x)/(sin(pi)/(2))=(15)/(15)],[[" (A) "19," (B) "15],[" (C) "16," (D) "20]]

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