-exp(-x)*sin(two *x) + two *exp(-x)*cos(two *x) = zero
minus exponent of ( minus x) multiply by sinus of (2 multiply by x) plus 2 multiply by exponent of ( minus x) multiply by co sinus of e of (2 multiply by x) equally 0
minus exponent of ( minus x) multiply by sinus of (two multiply by x) plus two multiply by exponent of ( minus x) multiply by co sinus of e of (two multiply by x) equally zero