Question

Estimate the area under the graph of f(x) = 5 cos(x) from x = 0 to x = π/2. (Round the answer to four decimal places.)

Answer 1

come on now, that's just the integral of 5cos(x)

$\bf \displaystyle \int\limits_{0}^{\frac{\pi }{2}} 5cos(x)\cdot dx\iff 5\int\limits_{0}^{\frac{\pi }{2}} cos(x)\cdot dx\implies \left.\cfrac{}{} 5sin(x) \right]_{0}^{\frac{\pi }{2}}$