B
bongtuyet96


[latex]4sin^{2}(\pi -\frac{x}{2})-\sqrt{3}sin(\frac{\pi }{2}-2x)=1+2cos^{2}(x-\frac{3\pi }{4})[/latex]
[latex]tanx(tanx+2sinx+1)-6cosx=3+sin(1+tanx.tan\frac{x}{2})[/latex]
[latex]tan(\frac{\pi }{2}+x)-3tan^{2}x=\frac{cos2x-1}{cos^{2}x}[/latex]
[latex]tanx(tanx+2sinx+1)-6cosx=3+sin(1+tanx.tan\frac{x}{2})[/latex]
[latex]tan(\frac{\pi }{2}+x)-3tan^{2}x=\frac{cos2x-1}{cos^{2}x}[/latex]