Grade 12Trigonometry
if cos x= 3cos y then 2tan (y-x)/2 is in form of cot
if cos x= 3cos y then 2tan (y-x)/2 is in form of cot
1 Answer
Aditya Gupta
write it as cosx/cosy = 3/1
now apply componendo and dividendo
(cosx+cosy)/(cosx – cosy)= (3+1)/(3-1)
now apply formulae for cosx+cosy and cosx – cosy
2tan(y – x)/2= cot(x+y)/2
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