Linear Algebra about finding inner product of arbitrary polynomials

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$f(x)$ and $g(x)$ are arbitrary polynomials of degree at most 2.

$\langle f,g\rangle=f(-2)g(-2)+f(0)g(0)+f(1)g(1)$

$f(x)=4x^2+4x-5$ and $g(x)=3x^2-6x-5$

find $\langle f,g\rangle$ and the angle between $\langle f,g\rangle$