$\frac{1+cosx}{sinx}\left [ 1-\frac{(1-cosx)^{2}}{sin^{2}x} \right ]$

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$BT=\frac{\left ( 1+\cos x \right )\left ( 2\cos x-2\cos x^{2} \right )}{\sin x\sin x^{2}}$
$=\frac{\left ( 1+\cos x \right )\left ( 1-\cos x \right )2\cos x}{\sin x\left ( 1-\cos x^{2} \right )}$
$=\frac{2\cos x}{\sin x}$
$=2\cot x$
đúng ui. hì :3 –  Lee Han 04-06-16 12:15 PM
dạ kcj :)) –  ☼SunShine❤️ 04-06-16 12:15 PM
mơn yến nha ^^ –  Lee Han 04-06-16 12:15 PM
c kiểm tra xem đúng chưa –  ☼SunShine❤️ 04-06-16 12:14 PM
ok r đó c –  ☼SunShine❤️ 04-06-16 12:14 PM
òm. cơ mak sao vẫn k đk kìa :'( –  Lee Han 04-06-16 12:13 PM
lần sau chị cho thêm $$ vào đầu và cuối bài lm nhea –  ☼SunShine❤️ 04-06-16 12:11 PM
ai sửa hộ cái =='' –  Lee Han 04-06-16 12:03 PM

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