Consider the integral approximation $M_{20}$ of $\int^{\frac{\pi}{4}}_{0}{\cos\!\left(x\right)} \, dx$.

Does $M_{20}$ overestimate or underestimate the exact value?

A. underestimates
B. overestimates

Find the error bound for $M_{20}$ without calculating $M_N$ using the result that $$Error(M_{N}) \le \frac{M(b - a)^3}{24N^2},$$ where $M$ is the least upper bound for all absolute values of the second derivatives of the function $\cos\!\left(x\right)$ on the interval $[a,b]$.

$Error(M_{20}) \le$