Bonjour pourriez vous m'aider je n'arrive pas a faire ces deux simplification merci d'avance
a=sin(- \frac{7x}{2}-x)+cos(x+3 \pi )+sin(x+ \frac{ \pi }{2})
a=sin(- x+ \frac{5 \pi }{2} )+sin(x-\frac{ \pi }{2} )+cos(x-2 \pi )
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