Trick and Derivation of Trigonometric Identities | Sum to Product | Product to Sum | CA Devinder Sir
Автор: Teaching Booth
Загружено: 2021-06-30
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This is the 3rd part of the 6th lecture on Trigonometric Functions of Class 11 Maths NCERT. In this lecture, you will understand the Sum to Product and Product to Sum trigonometric identities.
==========CONTENTS==============
00:00 Trick to remember Sum to Product Identities
04:42 Proof of Formula 𝒄𝒐𝒔𝒙+𝒄𝒐𝒔𝒚=𝟐𝐜𝐨𝐬((𝒙+𝒚)/𝟐)𝐜𝐨𝐬((𝒙−𝒚)/𝟐)
09:57 Proof of Formula 𝒔𝒊𝒏𝒙+𝒔𝒊𝒏𝒚=𝟐𝒔𝒊𝒏((𝒙+𝒚)/𝟐)𝒄𝒐𝒔((𝒙−𝒚)/𝟐)
12:36 Trick to remember Product to Sum Identities
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Trick and Derivation of Trigonometric Identities | Sum to Product | Product to Sum | CA Devinder Sir
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