Trick and Derivation of Trigonometric Identities | Sum to Product | Product to Sum | CA Devinder Sir

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
sum to product | sum to product identities | sum to product formulas | proof of sum to product identities | product to sum formulas | product to sum formula derivation | derivatives of trigonometry | trigonometry class 11 | teaching booth | trigonometric identities | trigonometric equations | trigonometric functions class 11 | trigonometric formulas | derivation of trigonometric identities | classes by ca Devinder Singh | trick to remember trigonometric identities | CA Devinder sir
Trick and Derivation of Trigonometric Identities | Sum to Product | Product to Sum | CA Devinder Sir

[@fierce4861]

Thankyou sir ❤️

[@srb1196]

Very helpful trick sir.... Thanks a lot

[@mypets.990m8]

Thanks sir although I know how to derive but I was confused in Finding values of Alpha and Beta, Thanks a lot Love From Pakistan

[@apworld5265]

Thank you so much sir

[@SonaliKumari-sw7vz]

Very helpful trick👍👍

[@merabua5505]

Thank you very much sir 💙💙💙❤️💞

[@uzmarahman8456]

Thank you so much sir🙂

[@alanjolly7918]

thank you so much sir :)

[@arhamshadid7855]

Best forever

[@irshualam2329]

😍😍

[@malaikaSheikh6]

superb 🤩

[@revathik5455]

Tq sir

[@AbhishekSingh-zy7km]

NYC 😍😍😍

[@chohanacademy786]

Sir why we let alpha plus beta equal to x

[@sarojamrit4201]

Good

[@Mrwink304]

Looks same as carryminati