10. Express the wave equation of the standing wave f(z,t) = A sin(kz)cos(kvt) as the sum of a wave traveling to the left and a wave traveling to the right.

(A)(A/2){sin[k(z+vt)] + sin[k(z-vt)]}

(B)(A/2){cos[k(z+vt)] + sin[k(z-vt)]}

(C)(A/2){sinh[k(z+vt)] + sinh[k(z-vt)]}

(D)(A/2){cosh[k(z+vt)] + cosh[k(z-vt)]}

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