Y=-2cos(-pi/4)

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Solution for Y=-2cos(-pi/4) equation: 


Y in (-oo:+oo)

Y = -2*cos(-pi/4) // + -2*cos(-pi/4)

Y-(-2*cos(-pi/4)) = 0

Y+2*cos(-pi/4) = 0

Y+2^(1/2) = 0 // - 2^(1/2)

Y = -2^(1/2)

Y = -2^(1/2)

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