Question
Download Solution PDFபின்வருவனவற்றை மதிப்பிடுக:
cos(36° + A).cos(36° - A) + cos(54° + A).cos(54° - A)
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFகொடுக்கப்பட்டது:
cos (36° - A) cos (36° + A) + cos (54° - A) cos (54° + A)
பயன்படுத்தப்படும் சூத்திரம்:
cos (a - b) = cos a cos b + sin a sin b.
sin (90 - a) = cos a
கணக்கீடு:
⇒ sin[90 - (36 - A)]sin[90 - (36 + A)] + cos (54° - A) cos (54° + A)
⇒ sin( 54º + A)sin(54º - A) + cos (54 ° - A)cos (54° + A)
⇒ cos (A - B) முற்றொருமையைப் பயன்படுத்துதல்,
⇒ cos(54 + A - 54 + A) = cos(2A)
எனவே, cos (36° - A) cos (36° + A) + cos (54° - A) cos (54° + A) இன் மதிப்பு cos(2A) ஆகும்.
Last updated on Jul 19, 2025
-> The SSC CGL Notification 2025 has been announced for 14,582 vacancies of various Group B and C posts across central government departments.
-> CSIR NET City Intimation Slip 2025 has been released @csirnet.nta.ac.in.
-> The SSC CGL Tier 1 exam is scheduled to take place from 13th to 30th August 2025 in multiple shifts.
-> Aspirants should visit the official website @ssc.gov.in 2025 regularly for CGL Exam updates and latest announcements.
-> Candidates had filled out the SSC CGL Application Form from 9 June to 5 July, 2025. Now, 20 lakh+ candidates will be writing the SSC CGL 2025 Exam on the scheduled exam date. Download SSC Calendar 2025-25!
-> In the SSC CGL 2025 Notification, vacancies for two new posts, namely, "Section Head" and "Office Superintendent" have been announced.
-> Candidates can refer to the CGL Syllabus for a better understanding of the exam structure and pattern.
-> The CGL Eligibility is a bachelor’s degree in any discipline, with the age limit varying from post to post.
-> The SSC CGL Salary structure varies by post, with entry-level posts starting at Pay Level-4 (Rs. 25,500 to 81,100/-) and going up to Pay Level-7 (Rs. 44,900 to 1,42,400/-).
-> Attempt SSC CGL Free English Mock Test and SSC CGL Current Affairs Mock Test.