Question

qual e o valor de sen 13pi/3rad?

Answer 1

$\mathrm{sen\,}\dfrac{13\pi}{3}\\ \\ =\mathrm{sen}\left(\dfrac{\pi+12\pi}{3} \right )\\ \\ =\mathrm{sen}\left(\dfrac{\pi}3+\dfrac{12\pi}{3} \right )\\ \\ =\mathrm{sen}\left(\dfrac{\pi}3+4\pi \right )\\ \\ =\mathrm{sen}\left(\dfrac{\pi}3+2\cdot 2\pi \right )\\ \\ =\mathrm{sen\,}\dfrac{\pi}{3}\\ \\ =\dfrac{\sqrt{3}}{2}$