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!