IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: 7ooD on March 28, 2010, 02:13:22 pm

Title: quick doubt in c3
Post by: 7ooD on March 28, 2010, 02:13:22 pm

write the following in simplest form involving only one trigonometric function

tanA/(sec^2A)-2

i tried to solve it as following

(sec^2A)=tan^2A+1

tan^2A+1-2

tan^2A-1

-(-tan^2+1)

tanA/-(-tan^2+1)

2tanA/-(-tan^2+1)

-2(1/2tan2A)

-tan2A

in the answers it says -1/2tan2a not -tan2a as i solved above wat did i do wrong

Title: Re: quick doubt in c3
Post by: Saladin on March 28, 2010, 03:45:26 pm

there u go

Title: Re: quick doubt in c3
Post by: 7ooD on March 28, 2010, 04:25:21 pm

lol my mind stopped i couldn't complete the rest thx dude

Title: Re: quick doubt in c3
Post by: Saladin on March 28, 2010, 05:08:46 pm

here to help u all