Lượng giác 11

C

chaconhe

dE~ WA' :))
[TEX]sinx (1-2(sinx)^2+2-2(sinx)^2)+\sqrt{3}{cos3x}=2cos4x[/TEX]
[TEX]\Leftrightarrow sin3x+\sqrt{3}{cos3x}=2cos4x [/TEX]
[TEX]\Leftrightarrow sin(3x+pi/3)=cos4x[/TEX]
bạn làm típ đi nha :D
 
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T

thienthanxanh_501

ai pro thi jup minh bai nay voi

tim m de 2 pt sau tuong duong:
sin3x+ cos2x = 1+2.sin3x. cos2x
sin3x - m.sinx =(4- 2|m|).sin^2x
(^-^) mem of bigzero group (^-^):)>-
 
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