Lesson#6
Pythagorean Identities
Fundamental Trignometric Identities
For any real number , we shall derive the following fundamental trigonometric identities:
i) sin^2 +cos^2 =1
ii) 1+tan^2 =sec^2
iii) 1+cot^2 =csc^2
Chapter No. 9
Fundamentals of Trigonometry
Exercise No. 9.2
mathematics
part 1
