text: 2n + 1 π/2 and your n belongs to Z. ಅರ್ಥ ಆಗ್ತಿದ್ಯಾ ಅಂದ್ರೆ ಎಲ್ಲರಿಗೂ? I hope this is clear. What is the reason students? Because here it is written as sin x by cos sorry sin x by cos x and here it is written as 1 by cos x.