Derivation of Trigonometric Identities | Formula | Functions | Class 11 Maths Ch-3 | CA Devinder Sir

Описание: This is the 2nd part of the 6th lecture on Trigonometric Functions of Class 11 Maths NCERT. In this lecture, you will understand the derivation of trigonometric identities.

===========CONTENTS==============
00:00 𝐜𝐨𝐬(𝒙−𝒚)=𝐜𝐨𝐬𝒙𝐜𝐨𝐬𝒚+𝐬𝐢𝐧𝒙𝐬𝐢𝐧𝒚
15:45 𝐜𝐨𝐬(𝒙+𝒚)=𝐜𝐨𝐬𝒙𝐜𝐨𝐬𝒚−𝐬𝐢𝐧𝒙𝐬𝐢𝐧𝒚
18:19 𝐬𝐢𝐧(𝒙+𝒚)=𝐬𝐢𝐧𝒙𝐜𝐨𝐬𝒚+𝐜𝐨𝐬𝒙𝐬𝐢𝐧𝒚
20:58 𝐭𝐚𝐧(𝒙−𝒚)=(𝐭𝐚𝐧𝒙−𝐭𝐚𝐧𝒚)/(𝟏+𝐭𝐚𝐧𝒙𝒕𝒂𝒏𝒚)
24:23 𝐜𝐨𝐭(𝒙+𝒚)=(𝐜𝐨𝐭𝒙𝐜𝐨𝐭𝒚−𝟏)/(𝐜𝐨𝐭𝒚+𝐜𝐨𝐭𝒙)

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