Let be $f:\mathbb{R}\rightarrow \mathbb{C}$. This $$\operatorname{Re} \int_a^b {{e^{ - i\theta }}f(x)dx = } \int_a^b {\operatorname{Re} ({e^{ - i\theta }}f(x))dx}$$
is True? Why?
Let be $f:\mathbb{R}\rightarrow \mathbb{C}$. This $$\operatorname{Re} \int_a^b {{e^{ - i\theta }}f(x)dx = } \int_a^b {\operatorname{Re} ({e^{ - i\theta }}f(x))dx}$$
is True? Why?