Question

calcule o valor seno,cosseno o tangente de cadq arco 3pi/4.

Answer 1

sen135º= sen(180-135)= sen45º=$\sqrt\frac{2}{2}$
cos135º=-cos(180-135)= -cos45º=$\sqrt \frac{-2}{2}$
tg135º=-tg(180-135)= -tg45º= -1