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Verify the identity cos(2x)/sin(2x)+2sin^2(x)=1/2(cot(x)-1). Need help? Solve the equation. cos^2(x)+1/2(1+cos(2x))=1? Will Trump send Melania or Ivanka to Mars to jump around in low gravity? What type of decay causes Ra-225 to become Ac-225? Algebra equation:
x-2y+z=2
2x-y-z=1
Solve the following system of equations using matrices. Please help!?