GATE IN 2024 | Question: 21

Question

The current $i(t)$ drawn by a circuit is given as
\[
i(t)=4+30 \cos (t)-20 \sin (t)+15 \cos (3 t)-10 \sin (3 t) \mathrm{A}
\]

The root-mean-square value of $i(t)$ is A (rounded off to one decimal place).