cos2B+cosB

sin2B-sinB

=sinB

cosb+1

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- Apr 21st 2008, 01:04 PMJono MathematicianMe again, dunno wot I am gonna do wif maths! lol
__cos2B+cos__B

sin2B-sinB

=sinB

cosb+1

start on TOP - Apr 21st 2008, 01:33 PMMoo
Hello,

Let's see the denominator :

Hence

Do you see the thing ? Do you see which formula for cos(2b) you will have to use ?

So

Now this is the tricky thing :

How did I know it ? Because I know where I want to go :D

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- Apr 21st 2008, 01:57 PMJono Mathematician
Seeing that I thanked you for your hard work, please help with this one :)

http://www.mathhelpforum.com/math-he...h-problem.html