`a(cosC-cosB)=2(b-c)cos^2A/2`

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awesome very very helpful video excellent keep doing sir

sauravkumar-recb
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First I felt that this question is too difficult for me then l was really mad with this question but now l could understand this easy, you nicely explains this....THANK YOU so much sir🙂🙂

gowrinandini
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Wait cos a - cos b =
-2sin(a+b/2)sin(a-b/2)
What about the minus sign?

arianagandhi
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Isn’t (cos c-cosb)= -2 sin
In ur video there is no negative sign .

nehacherian
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I was going mad with this Question, not able to solve it. I searched nearly all of the sites but most of them were too lengthy like 3 to 4 pages and many were not accurate. Somehow I got this video. Thank You Doubtnut for helping us solve easily. Really grateful to you guys.

adilsharafudheen
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solve this (b+c)cos(B+C)÷2=a cos(B-C)÷2

ramamakwana