bonjour;
svp,qui peut m'aider à simplifier cette expression:
A=cos(3pi/2-x)-sin(3pi/2-x)-cos(x-7pi/2)-sin(x-7pi/2)
svp,qui peut m'aider à simplifier cette expression:
A=cos(3pi/2-x)-sin(3pi/2-x)-cos(x-7pi/2)-sin(x-7pi/2)
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Bonsoir,
A = cos(3pi/2 - x) - sin(3pi/2 - x) - cos(x - 7pi/2)-sin(x - 7pi/2)
A = -cos(x + pi/2) - sin(x + pi/2) - cos(x - pi/2) - sin(x - pi/2)
A = -(cos(x)cos(pi/2) - sin(x)sin(pi/2)) - (sin(x)cos(pi/2) + cos(x)sin(pi/2)) - (cos(x)cos(pi/2) + sin(x)sin(pi/2)) - (sin(x)cos(pi/2) - cos(x)sin(pi/2))
A = -cos(x) - sin(x) - cos(x) - sin(x)
A = -2cos(x)
cos(x - 7π/2) - sin(x - 7π/2) = cos(x + π/2) + sin(x + π/2)
A = -(cos(x) - sin(x)) - (sin(x) + cos(x)) - (cos(x) - sin(x)) - (-sin(x) - cos(x))
A = -2cos(x + π/2)