HELP FAST PLEASE!!!
Show that sin(x+pi)=-sinx
2 answers:
Sin(a + b) = sin(a)cos(b) + sin(b)cos(a)
sin(x + pi) = sin(x)cos(pi) + cos(x)sin(pi)
sin(pi) = 0cos(pi) = -1
sin(x + pi) = sin(x)(-1) + cos(x)(0)
sin(x + pi) = -sin(x) + 0
Is it possible with only letters
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