Question

найдете производную функции y(x)=sinxcos3x+cosxsin3x
a) -4cos 4x
b) 4cost 4x
c) 2cos 4x
d) 4sin 4x
e) -2cos 4x

Answer 1

$y(x)=sinxcos3x+cosxsin3x \\ y(x)=sin4x \\ y'(x)=4cos4x$