Question
Download Solution PDFFind the value of
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
- cos 2A = cos2 A – sin2 A = 1 – 2 sin2 A = 2 cos2 A – 1
Calculation:
As we know that, cot x = cos x / sin x
As we know that,
As we know that, 0° < A / 2 < 90° where all trigonometric ratios are positive.
As we know that,
As we know that, 0° < A / 2 < 90° where all trigonometric ratio’s are positive.
So, from equation (1) and (2), we get
Rationalization above the equation
Last updated on Jun 18, 2025
->UPSC has extended the UPSC NDA 2 Registration Date till 20th June 2025.
-> A total of 406 vacancies have been announced for NDA 2 Exam 2025.
->The NDA exam date 2025 has been announced. The written examination will be held on 14th September 2025.
-> The selection process for the NDA exam includes a Written Exam and SSB Interview.
-> Candidates who get successful selection under UPSC NDA will get a salary range between Rs. 15,600 to Rs. 39,100.
-> Candidates must go through the NDA previous year question paper. Attempting the NDA mock test is also essential.