mohon dibantu matematika

f(g(x)) = x²+3x+1
f(x+1) = (x+1)² + x
f(x+1) = (x+1)² + (x+1) - 1
f(x) = x² + x - 1


2π/3 + 135° - 0.2π
= 2π/3 + 3π/4 - 0.2π
= 40π/60 + 45π/60 - 12π/60
= 73π/60