I think this is ur question
https://www.zigya.com/study/book?class=12&board=mbse&subject=Mathematics&book=Mathematics%20Part%20II&chapter=Three%20Dimensional%20Geometry&q_type=&...
Please find solution below.... There is some error in the question. In place of sin2ß it has to be sin²ß and same with cos2theta, it has to be cos²theta.... You will never get your...