Question

Considere a função f(x)=2sen(x) e determine:
A) o valor de f(π/2)
B)o valor de f(15π/4)

Answer 1

a) f(pi/2)= 2sen90  (pq pi/2=180/2=90)
    f(pi/2)= 2·1 = 2
b) f(15pi/4) = 2·sen 675 
(sen 675 = - sen 45)
f(15pi/4)= 2·(-√2/2)
f(15pi/4)= -√2