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1.prove that sinx.siny.sin(x-y) + siny.sinz.sin(y-z) + sinz.sinx.sin(z-x) + sin(x-y).sin(y-z).sin(z-x) = 0 2.f(α,β)= cos 4 α/cos 2 β + sin 4 α/sin 2 β then prove that f(α,β) = 1 3.cosA = tanB, cosB = tanC and cosC= tanA then show that sinA = sinB = sinC = 2sin18

1.prove that  sinx.siny.sin(x-y) + siny.sinz.sin(y-z) + sinz.sinx.sin(z-x) + sin(x-y).sin(y-z).sin(z-x) = 0


2.f(α,β)= cos4α/cos2β + sin4α/sin2β    then prove that f(α,β) = 1


3.cosA  = tanB, cosB = tanC and cosC= tanA


then show that sinA = sinB = sinC = 2sin18

Grade:12

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
2 years ago
Dear student

Please find the link attached

https://www.askiitians.com/forums/Trigonometry/23/4416/please-solve.htm


Regards
Vikas TU
14149 Points
2 years ago
Dear student 
Please ask single question in a thread , 
It will be easier for us to ans. 
Good Luck 
Cheers 

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