By using the formula which expresses sin a and cos a in terms of t , where t= tan (a/2) , show that

(1+sin a)/(5+4 cos a )=(1+t)^2/(9+t^2)

I can do this part .

Deduce that for all values of a .

I cant figure out this part .

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- Aug 16th 2009, 03:46 AMthereddevilsTrigo 7
By using the formula which expresses sin a and cos a in terms of t , where t= tan (a/2) , show that

(1+sin a)/(5+4 cos a )=(1+t)^2/(9+t^2)

I can do this part .

Deduce that for all values of a .

I cant figure out this part . - Aug 16th 2009, 05:08 AMrunning-gag
You just need to study the function defined over IR

- Aug 16th 2009, 07:50 AMthereddevils
- Aug 16th 2009, 11:44 AMrunning-gag
I am just saying that you need to study the function (variations, limits, ...)

Start by calculating the derivative (Wink) - Aug 16th 2009, 12:04 PMGrandad