if equation of tangent drawn to the curv...

if equation of tangent drawn to the curve `y=f(x)` at its point `P(3,5)` is `5x-4y+5=0` and `lim_(x-> 3) {3^(4f(x))-2(1+3+3^2+3^3+..........+3^19)-1}^2 /(1-cos(ln(4-x))) = 2(a3^blnc)^2` where `a,&c ` are prime numbers and `bepsilonN,`then find the value `a+b+c`

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