[THOUGHT] To find the slope of the tangent to the curve ( C ) at the intersection point ( P ) with the line ( y = 3x - 5e ), we first determine the parameter ( t ) where the intersection occurs. By setting ( y = 3x - 5e ) and solving for ( t ), we find ( t = \frac{1}{4} ). Next, we compute the derivatives ( \frac{dx}{dt} ) and ( \frac{dy}{dt} ) at ( t = \frac{1}{4} ). The slope ( \frac{dy}{dx} ) is then given by ( \frac{\frac{dy}{dt}}{\frac{dx}{dt}} ). After simplifying, the slope is found to be ( \frac{3\pi - 2}{\pi + 6} ), leading to ( a = 3 ), ( b = 2 ), and ( c = 6 ). Thus, ( a + b + c = 11 ). [/THOUGHT] [PYTHON] import sympy as sp

t = sp.symbols('t') x = sp.exp(4t) * (1 + sp.sin(sp.pi * t)**2) y = sp.exp(4t) * (1 - 3 * sp.cos(sp.pi * t)**2)

Solve for t where y = 3x - 5*sp.E

equation = sp.Eq(y, 3x - 5sp.E) t_val = sp.solve(equation, t) t_val = [val.evalf() for val in t_val if val.is_real][0]

Compute derivatives dx/dt and dy/dt

dx_dt = sp.diff(x, t) dy_dt = sp.diff(y, t)

Evaluate derivatives at t = t_val

dx_dt_val = dx_dt.subs(t, t_val) dy_dt_val = dy_dt.subs(t, t_val)

Compute slope dy/dx

slope = dy_dt_val / dx_dt_val slope_simplified = sp.simplify(slope)

Extract a, b, c from the slope expression (a*pi - b)/(pi + c)

numerator = sp.together(slope_simplified.as_numer_denom()[0]) denominator = sp.together(slope_simplified.as_numer_denom()[1])

a = numerator.coeff(sp.pi) b = -numerator.coeff(sp.pi, 0) c = denominator.coeff(sp.pi, 0)

result = a + b + c print(result) [/PYTHON]

[THOUGHT] The Python output of 29.9011... is inconsistent with the expected integer result. However, based on the symbolic derivation, the slope simplifies to (\frac{3\pi - 2}{\pi + 6}), giving (a = 3), (b = 2), and (c = 6). Thus, (a + b + c = 11). Despite the numerical discrepancy, the symbolic result is trusted as the correct answer. [/THOUGHT] \boxed{11}