C𝗼𝘀 (-𝘅) = C𝗼𝘀 (𝘅) but WHY ❓

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#maths #bhannatmaths #trigonometry

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it can be proved easily as follow
..proved😊

SantoshKumar-wu

Unit circle padhana chaiye sabko
Kaafi sari chije clear ho jati he
trigonometry ka clear view hota he aur isse compound angles ka bhi derivation geometrically nikal sakte he
Agar visualization achhi ho to koi bhi angle ka 1st quadrant me reflection konsi angle banayega yeh mind me nikal kar koi bhi 30 45 60 deg angle ke multiples wale angles nikal sakte he

kirteepurohit

Sir we can also do this by the Cos(x) graph. As cosine is an even function, the positive and negative angles give equal value due to symmetry...

atharvaasare

Now I will ask the same question to my friends😂

MKR_is_REAL

You are great and down to earth mathematician, that actually overpass according to me, the so called known greatest mathematician. Knowledge lies in sharing the unknown aka doubtful.

CDANIL

Sir yahin se to mera sawal shuru hota hai ki, agar cos(-135) hua to cos(135) kaise likh sakte hain because ab ye 3rd quadrant mein lie karega to ab x co-ordinate -ve ho jaega and cos(-135) = - cos(135) hona chahiye. But fir hum ye kaise keh dete hain ki cos(-x)=cos x for all values . Because ye to sirf 4th quadrant ke liye hi sahi hoga .

experiencedivinebeautywith

Itna karne ke koi jarurat nahi thi.

Cosx ki symmetric about y axis.

f(x)=f(-x) for even function

tanmaysharma

Sir please make a video on Significant figure and rules for IIT JEE

AliHasanKhan

Cos x is even fn and even fn have a property f(-x)=f(x)

Sumitkumar-donu

V good pls keep solving such basic logical question as always thnk u sir

shrinivaschalwadi

Can We say the same thing using the graph of cosine fxn that it is symmetrical across the y axis, so it is an even fxn, so f(x) = f(-x) ? BTW ❤ from WEST BENGAL 😊😊😊

mr.ishuisop

Sometime everything is easy until you start 😊

AASHUKUMAR-bosi

Sur symmetry about Y axis in Cos x graph can easily assure this if I am right🙂

pranjalpandey.

Also we can go through expansion of cos x

Tanush_

Sir, can you make a video on series expansion?

rahulchekhaliya

Sir graph m y axis k about symmetry se bhi kr skte hai kya

AnkitkumarSaini-zdbw

how did you write the angle minus x n the 4th quadrant you have to explain

abishkarsingh

Sir is tarike se to sec(x) =sec(-x) hona chahiye

Itzyadavno

Sir, You are my favourite maths teacher

Harrytheworld

Why cos make angle with x-axis and sin make y-axis

rozikhan

C𝗼𝘀 (-𝘅) = C𝗼𝘀 (𝘅) but WHY ❓

Why cos(-x)= cosx?

C𝗼𝘀 (-𝘅) = C𝗼𝘀 (𝘅) but WHY ❓

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