Trigonometric Functions 09 | Practice Session | Crack Best Problems with Trigonometric Formulae |

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PACE - Class 11th :

Scheduled Syllabus released describing :-
which topics will be taught for how many days.

Duration:-3months (Nov 2020 - Feb 2021)
Free Batch Exclusive on our YouTube Channel:PhysicsWallah-Alakh Pandey

Batch Details

1)Best Faculties across India for different Subject/Topics.
2)Complete & Relevant Syllabus Coverage of Class-11th within 3 Months- Fastrack Nov 20,2020-Feb 20,2021
3)Monday-Sunday : scheduled Classes everyday ( for each Physics, Chemistry,Mthematics & Biology)
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5)Notes Link on Description

Physics:Tues,Wed,Thur,Fri,Sat : 3:00 pm
Chemistry: Physical & Inorganic Chem: Mon,Tue,Wed,Thur,Fri:7:00 pm|| Organic Chemistry:Sat,Sun : 9:00 pm
Mathematics:Wed,Thur,Fri,Sat,Sun: 5:00 pm
Biology:Wed,Thur,Fri,Sat,Sun: 10:00 am

4)Scheduled Syllabus released describing :-
which topics will be taught for how many days.

Lakshya Batch-Complete Physics for Class 12th BOARDS/JEE MAIN/NEET
Yakeen Batch-Complete Fastrack Course(11th & 12th) for NEET
Accelerate Batch-Complete Fastrack Course of PCMB for Boards/NEET/JEE Mains
Prayas Batch-Complete Fastrack Course of PCM for JEE Mains &JEE Advanced

[AmanRaj-zubw]

00:12 Bulati hai magar aane ka naiii, ye Trigo hai ghabrane ka naiii, OP entryy 😹😹💫✨

[monishdeshpande]

43:49 Let theeta= 18
5 theeta=90
2theeta+3theeta=90
2theeta=90-3theeta
apply sin on both side
sin2theeta=sin(90-3theeta)
sin2theeta=cos3theeta



4cos^2theeta-2sintheeta-3=0

4-4sin^2theeta-2sintheeta-3=0
4sin^2theeta-2sintheeta-1=0
by factorisation we get square root of 5-1/4

[rashmisatpathy]

24:11👈👈Yahan se suru hua iss question ka solution, chalta gaya chalta gaya and yahan jaakar khatam hua 👉👉40:25
Aise question maine jindagi me first time dekha hai aur isko best explain karne wale teacher bhi first time dekha hai. Salute aman sir 🙏🙏🙏👍👍👍

[kumarsoham]

answer of question 7 is 1/8 .because cos 7 pi/8=cos pi/8 similarly cos 5 pi/8=cos 3 pi/8 the expression will become (1-cos square pi /8 ) (1-cos square 3pi/8)=( sin square pi/8 ). (sin square 3 pi/8) =(2/2 sin pi/8 .sin 3 pi/8 )square= (cos pi/4 - cos pi/2)square/4= 1/2/4=1/8

[nikhildehkora]

Aman sir left Allen Rohtak coaching❤️ institute...
Only for us...
Like 👍✌️ for Aman sir..

[rahulsah]

I am from Nepal and I think he is the best concept teller in the whole Nepal and India

[Knotdipu]

Sir ka entry is a stress buster for many ... ❤️❤️❤️😂😂😂

[miskhatverma]

40:42 sir sikh ka to pata nahi par sir dard kaafi hard mila😭

Yarrr itnaa kuch humare dimag me kaise aayega ki kaha kon sa formula use kare. Humari to halat kharab ho gyi, , aapne jaise bnaya waise chhap liya mene🙏🏾

[IndiLores]

50:24, answer of home work question is 1 by 8
तूफानों से लड़े बिना बस की पार नहीं होती
कोशिश करने वालों की कभी हार नहीं होती

[mathsmod]

1/8 (the cos’s are the roots of cos 4x=0. Expand this using cos 2x formula and put y= cos x to get 8y⁴-8y² +1=0. Finally substitute z=y-1 and use the formula for product of roots)

[manishadave]

Q.4 at 28:35 can be solved more easily by applying cosAcos(60-a) cos(60+a)= 1/4 cos3A. It can be applied between cos π/15, cos 6π/15, cos 4π/15 and cos 2π/15, cos 7π/15, cos 3π/15. The equation will be 1/4 cos π/5 * 1/4 cos 2π/5 * cos 5 π/15. From here it can be solved much easily.

[fanofbabymochi]

Q.3 solved sir thank you for providing our basic nicely and where to use all the formulas

[truthteller]

40:34 only those can solve who already solved it for 2 times freshers don't be demotivated

[avinashmeena]

Answer of last question is
𝘼𝙝𝙢𝙖𝙙𝙖𝙗𝙖𝙙 =1/8

[slamtv]

22:21 we can use the formula under the brackets... and then open the brackets with square...
I did it in this way...😃👍🏼

[kamalmaurya]

Q no. 4 ....
Short trick .
If cos¢ is in product and theta is in series of double then the answer will be 1/2^n

[toontonicjee]

Last Homework Calcutta se bolta he apun answer Allahabad hoga Bhai ko duao me yaad rakhna
3π/8)=sin^2 π/8 sin^2 3π/8 = 1-cosπ/4 whole divided by 2 * 1-cos3π/4 whole divided by 2= 1-1/√2*1+1/√2 whole divided by 4 = 1-1/2 whole divided by 4= 1/8❤️❤️❤️❤️❤️❤️❤️love and respect for Bhannat Aman Sir from Kolkata

[pawarsaab]

Q-3 done [cosα + cosβ]^2 + [sinα +sinβ]^2 mein cos c + cos d and sin c -sin d ki identity lagake 4 cos^2 α+β\2 common nikal do and andar bracket cos ^2 a + sin^2 a ka formula lag jayega and answer aa gya

[princetigunayak]

Sir mujhse first question lecture dekhne ke baad solve ho gya ekdam

[krishpatel]

Nowadays every teacher of pace batch is competating for best entry 😃