@@suhanisharma6996 As we know, cos 2x = 2cos^2 x - 1 On interchanging we get, 2cos^2 x = cos 2x + 1 cos^2 x = (cos 2x + 1)/2 cos x = whole under the root [(cos 2x + 1)/2)] On substituting the value of x as 15° We get cos 15° = whole under the root [(cos 30° + 1)/2] cos 15° = whole under the root[({roo3/2} + 1)/2] cos 15° = whole under the root[({root3 + 2}/2)/2] cos 15° = whole under the root[{root3 + 2}/4]
The answer of OP is correct as well. cos 15° will be equal to (root 3 + 1)/(2 root 2) when we'll use the formula cos (A - B) = cos A cos B + sin A sin B cos 15° = cos (60° - 45°) cos 15° = cos 60° cos 45° + sin 60° sin 45° cos 15° = (1/2 × 1/root 2 ) + ([root 3]/2 × 1/root 2) cos 15° = (1/2 root 2) + (root 3 / 2 root 2) cos 15° = (root 3 +1) / (2 root 2) I sincerely apologize for overlooking the reason for op's answer earlier.
sir pzzz thora basics pdau ap to ye soch rai pd reo ki sbhi 2 drop vele haiii isliye liye ye batch shuru hua hai umki ciunciling ni hiuu sirr pzzz basic maths bataiye all about fractiins hme kuj ni ata
Aap inse basic mathematics ka atleast 5 lecture leke dekho fir decide karo aapko ache se smjh aa rha hai ya nhi ye aakash Institute mein pehle padha chuke hai concept acche se clear karate hai ekdam
Yakeen NEET 4.0 - physicswaladev.page.link/5Edn4WFN3ZrKv4aq6
amazing lecture sir, 😃
thank you so much for your efforts
Phli baar aapse padh rhi sir bahut accha padhate ho aap sab clear ho gya
tabadtod session.... loved that.... pw rockksssss
Thankyou sooooo muchhh sirr ❤️❤️🥰🥰😚😚😚🎊💐🥳🥳amazing lecture 🎊
14:29 sir mera dill kush hogya 💖🎯🤐
Sir summary lecture ya revision lecture me questions bhi kra dena.
And lecture was fantastic.
Amazing lecture sir ji❤❤
Cos15°=√3+1/2√2 ,
Cos75°=√3-1/2√2 ,
Cos135°= -1/√2 ,.
Thank u sir ❤
The answer of cos 15° will be whole under the root [(root3 + 2)/4]
@@yadeep_thapa noo
@@suhanisharma6996
As we know,
cos 2x = 2cos^2 x - 1
On interchanging we get,
2cos^2 x = cos 2x + 1
cos^2 x = (cos 2x + 1)/2
cos x = whole under the root [(cos 2x + 1)/2)]
On substituting the value of x as 15°
We get
cos 15° = whole under the root [(cos 30° + 1)/2]
cos 15° = whole under the root[({roo3/2} + 1)/2]
cos 15° = whole under the root[({root3 + 2}/2)/2]
cos 15° = whole under the root[{root3 + 2}/4]
The answer of OP is correct as well.
cos 15° will be equal to (root 3 + 1)/(2 root 2) when we'll use the formula cos (A - B) = cos A cos B + sin A sin B
cos 15° = cos (60° - 45°)
cos 15° = cos 60° cos 45° + sin 60° sin 45°
cos 15° = (1/2 × 1/root 2 ) + ([root 3]/2 × 1/root 2)
cos 15° = (1/2 root 2) + (root 3 / 2 root 2)
cos 15° = (root 3 +1) / (2 root 2)
I sincerely apologize for overlooking the reason for op's answer earlier.
Basic math - kya mast padhate ho aap crystal clear 🗿
Rotation - mr sir se padhke dekte hai samjh me aata ki nhi inse nhi ho rha 🤡
Thank you sir for amazing lecture 😇
Sir aapne boht aache se pdhaya thanks sir
❤❤❤❤ OP SIR JII
Tanuj bansal sir like here✌❤❤👍
Pehli bar apse padh rahi hu bhut achaa samjh me aaya sir
Thanku sir❤
❤❤best teacher and best lecture sirr ❤❤
Jagjot sir op ✅
Sir bhot badhiya padhate hain ap,❤❤
sir pzzz thora basics pdau ap to ye soch rai pd reo ki sbhi 2 drop vele haiii isliye liye ye batch shuru hua hai umki ciunciling ni hiuu sirr pzzz basic maths bataiye all about fractiins hme kuj ni ata
Sir basic se hi padha rhe h
Kuchh nahi kaha ka basic hai 😢
❤❤❤❤❤❤❤❤❤ physics king Jag jot sir
Yakin 4.0 batch me kitna syllabus ho chuka h btana please
Work power energy takk
@@Dr.Abhinav07 ok le liya maine batch ab to bhaii
Sir application par live ka option nhi aa rha
Dpp kaha milegi
Keep it up
Who wants justice for lady doctor 🏥
Ja Bhai tu hi kra le
Next class bhi isi channel pr h kya
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Thanks sir
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Sir kya phy and chemistry JEE level tak padha jayega
Same question 😅
Haa jee mains tkkk
Live classes for whole syllabus
Done sir😊😊
Padh lo basic math bahut achha sir ji samjha rahe hai ❤
Notes kb milega sir
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Thnx
sir aapna board refresh kar liya kariya lecture accha laga mujhe
Sir please ayudh sir ki tarah concept ko acche se samjhaye na please 🙏🙏
Haa naa
Aayudh sir nhi MR sir best hai
Puppy kiii jayyyyyyu
Ayudh sir best hai ya ye sir koi to batao
@@AP-dz7wkTereko dono mein se kisse better samjh aaya
Hlo sir
7/ 5
Sir Aaj physics ki class nhi chalgei
Ky mst class hai mjaaa agyaa❤❤❤ kssm se
agar koi pheli baar padh raha h to kya in sir se padh skte h ??
@@_army_538bilkul qki ye sir bhut mst pdhate h
@@Neet2525bro please tell me Ayudh sir or rajkot sir?
Please give yr honest reply
Kuch samjh me nhi aaya trigonometry
Kya inn sir se pdhke selection ho jayega plss tell
101% ho jayega lekin Tera hardworking bhi hona chaiye
@@HarshJangra-mv2vd yes I am ready for that prr mne inn sir ko kbhi dekha nhi or pdha bhi nhi hai toh puch rhi thi bss
Aap inse basic mathematics ka atleast 5 lecture leke dekho fir decide karo aapko ache se smjh aa rha hai ya nhi ye aakash Institute mein pehle padha chuke hai concept acche se clear karate hai ekdam
@@AdityaSinha-yw5br okk
@@ShivaniYadav-b4f Basic maths nahi bhai . wo to sab hi acha padhate hai. Motion in a straight line ke pehle lecture me tum khud decide karloge
PBP/HHB ki dusri full form kis kis ko pta he
Sir aapne Steradian nhi padhaya
D
I will get 170 in phy
kua basics se padhaya ja rha he
Yes
Ayudh sir bohot zyada achha padhate hai but backlog hogya hai 😭😭
Are yrr to ro q rhe ho
Kon kon telegram se aya he yaha
Ayudh sir best hai ya ye sir koi to batao
Jagjot sir best hai ❤
@@yashjhambia inke notes mai se hi quetio aate hai kya...?
@@NCERTshala-vd8lr bhai backlog ho gaya hai isliye puch raha tha.....
Sare teacher best hai tu decide krega aukhat dkhi hai apni 😡😡😡
All are best yaar
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❤❤❤❤❤❤❤❤❤ physics king Jag jot sir
Ty sir aap boht amazing pdhate ho