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ironman2


Giải phương trình:
1.3(1+cos2x/cos^{2}x)+tan^{6}x=7
2.tan^{2}x+tan^{2}xsin^{3}x+cos^{3}x+1=0
1.3(1+cos2x/cos^{2}x)+tan^{6}x=7
2.tan^{2}x+tan^{2}xsin^{3}x+cos^{3}x+1=0
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