Bonjour Ahleur6007julinouni
[tex]A=\sin(2\pi+x)-\sin(2\pi-x)\\A=\sin(x)-\sin(-x)\\A=\sin(x)+\sin(x)\\\\\boxed{A=2\sin(x)}[/tex]
[tex]B=\cos(11\pi+x)\\B=\cos(10\pi+\pi+x)\\B=\cos(5\times2\pi+\pi+x)\\B=\cos(\pi+x)[/tex]
[tex]\boxed{B=-\cos(x)}[/tex]
[tex]C=\cos^2(\dfrac{\pi}{2}-x)+\sin^2(\dfrac{\pi}{2}+x)\\\\C=\sin^2(x)+\cos^2(x)\\\\\boxed{C=1}[/tex]
