Скачать или смотреть Find cos 15° Step by Step | Trigonometry Using cos(A−B) Identity | Class 10 Maths

In this video, you will learn how to find the exact value of cos 15° using the trigonometric identity cos(A − B) in a clear and step-by-step manner.
By taking A = 45° and B = 30°, we apply the identity
cos(A − B) = cosA cosB + sinA sinB
to calculate cos 15° easily without memorizing any extra formulas.

This method is extremely important for Class 10 Maths Board Exams 2026, as similar questions are frequently asked in exams and sample papers.
The explanation is simple, concept-based, and exam-oriented, making it perfect for average as well as weak students.

This video will help you: • Strengthen trigonometry fundamentals
• Improve calculation speed
• Gain confidence in board exams

Watch the complete video for full clarity and better understanding.

#Class10Maths
#Trigonometry
#cos15degree
#cosAminusB
#TrigonometricIdentities
#CBSEClass10
#Board2026
#MathsForBoards
#ExamPreparation
#LearnTrigonometry
#Class10MathsWithVikashSir