0 votes 0 votes In first question stationary point is given pi/4 and 3pi/4 . But how 3pi/4 ??? Its not in the intervel ?? abhishekmehta4u asked Sep 9, 2018 abhishekmehta4u 398 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply arvin commented Sep 9, 2018 reply Follow Share its in the interval 3pie/4 = 135degress<180 degress. 0 votes 0 votes arvin commented Sep 9, 2018 reply Follow Share and morever 0<x<180 means 0<2x<360... 0 votes 0 votes Please log in or register to add a comment.