Harmonic oscillations: body total energy

E=(m⋅v22)+(k⋅x22)E = (\frac{m\cdot v^{2}}{2})+(\frac{k\cdot x^{2}}{2})
E - energy
m - mass
v - speed (velocity)
k - stiffness
x - declination
Find   It is known that:
      =   
Calculate 'E'

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