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Question No. 20, Question No. 21, Question No. 22
380 Views • Sep 01, 2015
Description
Toolkit for Exercise 9.4
Prove the following identity:
Question No. 20
Q20: sin^3 θ−cos^3 θ=(sinθ−cosθ)(1+sinθcosθ)
Question No. 21
Q21: sin^6 θ−cos^6 θ=(sin^2 θ−cos^2 θ)(1−sin^2 θcos^2 θ)
Question No. 22
Q22: sin^6 θ+cos^6 θ=(1−3sin^2 θcos^2 θ)
Exercise No. 9.4
Chapter No.9
Fundamentals of Trignometry
maths
part 1
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