1) The number of principal solutions of $\tan 2\theta$ =1 is A) one B) two C) three D) four Answer: Option BExplanation: We have , $\tan 2\theta$ = 1 Here, the value of $\tan 2\theta$ is positive . So, $\theta$ lies in 1st and 3 rd quadrants $\therefore$ Number of principal solutions of $\tan 2 \theta$= 1 , is two
