Question

calcule A = sem x/2 -3cons2x + sen3x/4, sabendo que x=π/2 rad

Answer 1

$sen \frac{\pi}{4} + - 3cos\pi + sen \frac{3\pi}{8} \\ \pi = 180 \\ sen45 - 3cos180 + sen \frac{135}{2} \\ \frac{ \sqrt{2} }{2} - 3( - 1) + sen \frac{135}{2}$
talvez vc tenha digitado alguma coisa errada