Question

determine o valor numerico das expressoes , para x=pi y=cos4x+sen2x

Answer 1

pi = 180º

y = cos 4 x 180 + sen 2 x 180
y =  1 + 0
y = 1

Answer 2

$y=cos4 \pi + sen2 \pi = 1$ ou 
$y=cos4*180+sen2*180 = 1$

π=180 graus :.