trigonometrical ratios of multiple angles polytechnic 1st semester maths

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In this video titled "Trigonometrical ratios of multiple angles polytechnic maths example solution" i am going to solve 5 book trigonometry examples, i am teaching polytechnic 1st semester maths unit 1 trigonometry chapter 4 trigonometrical ratios of multiple angles.

Link of all video of maths -

syllabus - https://youtu.be/aL1QhbJF4h8?si=nONGOs7Wpb2sBiv8
maths syllabus - https://youtu.be/EhTID0zYJ6Y?si=yD0F5AI6_z7rqP3H

UNIT 1 TRIGONOMETRY

CHAPTER 1 TRIGONOMETRY
https://youtu.be/9N0nP2X9hxw?si=062pIZi1CKCcVSZM
https://youtu.be/sGg0ZL7Jrxg?si=QfUNLLl4_ijfjJez
https://youtu.be/YzAktHYFHcM?si=PtDNnFg_koV4_i0V

CHAPTER 2 TRIGONOMETRICAL RATIOS OF ALLIED ANGLES
https://youtu.be/9aDUcHp39D8?si=9O_ZIGHQfJ4ycN6I
https://youtu.be/SNhSPtRZjKE?si=qVV8mGWgnCbwiI-k
https://youtu.be/139i-SvT0qY?si=E6DsFQBuGjw14Mve
https://youtu.be/mv9CH13ikd4?si=gGdHAogtxcm0btjM
https://youtu.be/ZfBKurA6zak?si=eHJQEPrNBNXHepoH

CHAPTER 3 TRIGONOMETRICAL RATIOS OF COMPOUND ANGLES
https://youtu.be/P3ysF5Tm2X8?si=5f85mQJsV00LS16a
https://youtu.be/7bm3CNx8V94?si=EKRS-rBDcS3gJtAo
https://youtu.be/R6o4PvnrpgM?si=Ad5kdR8I-2fKMQy9
https://youtu.be/ppjhYpLGGM4?si=A1RGoyS6nuTRikWO
https://youtu.be/Snz0jomUE5Q?si=RQ01BuF0q3w7w3gm
https://youtu.be/8iYQhtUd1dg?si=JEMNPDoYsr01iHkH
https://youtu.be/22XueLMdins?si=SHknNXVgMRTx-YBu
https://youtu.be/zBu238Ti9YE?si=A4gy8BLJd8AtlJL5
https://youtu.be/hTOD_gKPIKA?si=e2HCziTRzp57lXSt
https://youtu.be/QabgX2N1rO0?si=04f0BtoBMpkLRNcy
https://youtu.be/x0Fbloi_6ZU?si=tEbs2l-t4ymp0C5h
https://youtu.be/jXUtRH_0fB4?si=_6qqwj8tRfH9gb4S
https://youtu.be/ApVYjrBPy3A?si=osGcOA4xgyxEhfe6

CHAPTER 4 TRIGONOMETRICAL RATIOS OF MULTIPLE ANGLES
https://youtu.be/h7EfdJlQxvI?si=RrtZqAdwjzbuYWQi
https://youtu.be/cfOBT7Sjfys?si=I_uVOwnHKFIXGWa8

All important Links -

💥Telegram Channel link (for notes, pdf) - https://t.me/polytechnicbter

Questions solved in this video -
00:17 - 1. prove that (1+cos pii/8)(1+cos3pii/8)(1+cos5pii/8)(1+cos7pii/8)=1/8
04:25 - 2. prove that cos^2A + Cos^2 (A+120) + cos^2 (A-120) = 3/2
08:00 - 3. prove that sin square A plus sn square 120 plus A plus sin square 120 minus A is equal to 3 upon 2
12:27 - 4. prove that sin A sin (60-A) sin (60+A) = 1/4Sin3A
17:03 - 5. prove that tan 20 degree tan 40 degree tan 60 degree tan 80 degree = 3

Polytechnic sem 1 classes -
Previous year polytechnic solved question paper - https://youtube.com/playlist?list=PLRATefFMZkjYa6wCdBKxIjAs_m19clAmv&si=KNDOUHoF_N91zxyK
Mathematics 1 (1001) - https://youtube.com/playlist?list=PLRATefFMZkjaS32hNSCPtcnqzh9HNzP8l&si=LDe_Mpe8SxhTwdNB
Mathematics 2022 - https://youtube.com/playlist?list=PLRATefFMZkjYdbwHFR-4szV_DOsG0tOGp&si=sZcpuzfAfrHldCw7
Applied Physics (1002) - https://youtube.com/playlist?list=PLRATefFMZkjaCrA53zP0Loc66XmFwYsCE&si=xoj4XY3SZ8gqjXe5
Applied Physics 2022 - https://youtube.com/playlist?list=PLRATefFMZkjYfijKznxBL-XZHdGiYtqw0&si=zX9UlHjHBfP6WFW4
Applied Chemistry (1003) - https://youtube.com/playlist?list=PLRATefFMZkjaKt6NUAvE45N2SXQVxWsmw&si=AkmV86ZtBOk8Ca4-
Applied Chemistry 2022 - https://youtu.be/KfwZwd2Nvrg?si=2ysPMCE2ehmVd2Jo

Polytechnic 2nd Semester Classes -
Mathematics (2001) - https://youtube.com/playlist?list=PLRATefFMZkjZ3E9BgN78uOZ2ffX3r9Ml5&si=P0ZtvzG7xOu5KTGH
Applied Physics (2002) - https://youtube.com/playlist?list=PLRATefFMZkjZ_Qy_dbrRhNU0_nsfbPo-K&si=lNR5cQSIts_K7XQ9
Engg Mechanics - https://youtube.com/playlist?list=PLRATefFMZkjaou0gU4KlM3sjLx0NowSSb&si=neMP7MDCML3K18nk
Fundamentals of EEE -
Introduction to it system - https://youtu.be/rRl6dTeqr0I?si=FUq5tl4nV2bKCpF1

Polytechnic 3rd semester computer science classes - https://youtube.com/playlist?list=PLRATefFMZkja7EoPZkL4MvOQgFb0IXTDa&si=kIVeIb_CBbJwN0lB
Computer architecture organisation -
scripting language (python) -
data structure - https://youtube.com/playlist?list=PLRATefFMZkjYEhszQBR5-9-wmARWgZ0w-&si=ydS1JX7oAEDL0pWO
computer programming -
algorithm -

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