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mianechanyeol
2 năm trước
Mn giúp mình giải giúp mình với ạ a, sin(2x+pi/4) = cos (x+pi/3) với 0<x<2pi b, cot (45độ -x) = căn3 /3 c,tan (x-pi/4) + tan (2x + 3pi/4) =0 với 0<x<pi d, cot^2x =1
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