cos(п-45°), sin(-3п/6)

Question

cos(п-45°), sin(-3п/6)

---

Answer 1

cos(п-45°)=cos п cos 45⁰ + sin π sin 45 ⁰ = -1 · √2|2  + 0 · √2/2= -√2/2

  sin(-3п/6) =   -  sin( π/2) = -1