Qualification > Math
C1 and C2 DOUBTS HERE!!!!!
~ Miss Relina ~:
--- Quote from: astarmathsandphysics on December 28, 2011, 10:38:37 pm ---Some trig proofs and quadritic roots worked examples.
--- End quote ---
Thanks alot Sir .....I really appreciate your help ;)
~ Miss Relina ~:
--- Quote from: ~ Miss Relina ~ on December 29, 2011, 07:33:06 am ---Thanks alot Sir .....I really appreciate your help ;D ;D ::)
--- End quote ---
but wait a second......is that for me ??? ::) ::) ::)
I think you posted the answers for questions in that thread.....lol ;D ;D ;D
https://studentforums.biz/math-146/quadratics-and-trigonometry-problems!/
whale95:
Note = [2] means to the power of 2
Q) The equation of the curve is y = 3cos2x. The equation of a line is x+2y=? (pi) . On the same Diagram, sketch the curve and the line for 0<x<? .
Find the first 3 terms in the expansion of (2-x)[2] in ascending power of x.
I did the graph but didnt know how to do the line! :S
Q)2cos? = 1/tan? 0<?<2?
I did upto cos?(2sin?-1)=0
so cos?=0 so 0
and 2sin?-1=0 so pi?/6 and pi5?/6
so now I have 3 answers which are in bold! how did pi?/2 and 3pi?/2 come??
Q)sinx=3/5 and angle is obtuse. Find tanx and cosx
Q) sin[2]theta/1-costheta = 1 + costheta Identities! Sorry if I copied it wrong! next time I will use attachments! to make it easier!
thanks alot i really benefited from the 1st answers! :D
~ Miss Relina ~:
attached
astarmathsandphysics:
whale95 I can't read your question cos of all the question marks.
Please modify your post
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