Question

“A vingança nunca é plena, mata a alma e envenena"

Determine a imagem da função
f(x) = 1 + 2 sen(x)

a) [−1,3]
b) [−1,2]
c) [1,2]
d) [−3,2]
e) [2,1]

Answer 1

$\large\boxed{\begin{array}{l}\sf f(x)=a+b\cdot sen(cx+d)\\\sf Imf(x)=[a-b,a+b].\\\sf f(x)=1+2sen(x)\\\sf a=1~~b=2\\\sf Imf(x)=[1-2,1+2]=[-1,3]\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~a}}}}\end{array}}$