M moesizlak Dec 2010 7 0 Jan 30, 2011 #1 v) sin^2x=1-cosx vi)sin^2x=1 vii)1-cos^2x=2sin x viii) sin^2 x=2cos^2 x ix) 2sin^2 x=3cos x x) 3tan^2x-10tan x +3=0 thanks in advance really stuck !

v) sin^2x=1-cosx vi)sin^2x=1 vii)1-cos^2x=2sin x viii) sin^2 x=2cos^2 x ix) 2sin^2 x=3cos x x) 3tan^2x-10tan x +3=0 thanks in advance really stuck !

chisigma MHF Hall of Honor Mar 2009 2,162 994 near Piacenza (Italy) Jan 30, 2011 #2 v) \(\displaystyle \sin^{2} x = 1-\cos x \implies 1-\cos^{2} x = 1-cos x \implies 1+\cos x = 1 \implies \cos x =0\)... Kind regards \(\displaystyle \chi\) \(\displaystyle \sigma\)

v) \(\displaystyle \sin^{2} x = 1-\cos x \implies 1-\cos^{2} x = 1-cos x \implies 1+\cos x = 1 \implies \cos x =0\)... Kind regards \(\displaystyle \chi\) \(\displaystyle \sigma\)

skeeter MHF Helper Jun 2008 16,217 6,765 North Texas Jan 30, 2011 #3 moesizlak said: v) sin^2x=1-cosx 1 - cos^2x = 1 - cosx cosx - cos^2x = 0 cosx(1 - cosx) = 0 cosx = 0 , cosx = 1 x = 90 , 270 ... x = 0 , 360 Click to expand... same idea with the rest. show us something.

moesizlak said: v) sin^2x=1-cosx 1 - cos^2x = 1 - cosx cosx - cos^2x = 0 cosx(1 - cosx) = 0 cosx = 0 , cosx = 1 x = 90 , 270 ... x = 0 , 360 Click to expand... same idea with the rest. show us something.

Prove It MHF Helper Aug 2008 12,897 5,001 Jan 30, 2011 #4 chisigma said: v) \(\displaystyle \sin^{2} x = 1-\cos x \implies 1-\cos^{2} x = 1-cos x \implies 1+\cos x = 1 \implies \cos x =0\)... Kind regards \(\displaystyle \chi\) \(\displaystyle \sigma\) Click to expand... Though shalt not divide by 0... Reactions: Archie Meade and skeeter

chisigma said: v) \(\displaystyle \sin^{2} x = 1-\cos x \implies 1-\cos^{2} x = 1-cos x \implies 1+\cos x = 1 \implies \cos x =0\)... Kind regards \(\displaystyle \chi\) \(\displaystyle \sigma\) Click to expand... Though shalt not divide by 0...

mr fantastic MHF Hall of Fame Dec 2007 16,948 6,768 Zeitgeist Jan 31, 2011 #5 moesizlak said: v) sin^2x=1-cosx vi)sin^2x=1 vii)1-cos^2x=2sin x viii) sin^2 x=2cos^2 x ix) 2sin^2 x=3cos x x) 3tan^2x-10tan x +3=0 thanks in advance really stuck ! Click to expand... Please don't post more than two questions in a thread. Otherwise the thread can get convoluted and difficult to follow. See rule #8: http://www.mathhelpforum.com/math-help/f12/list-rules-used-moderate-mhf-please-read-carefully-before-posting-151418.html. Thread closed. Reactions: Ackbeet and chisigma

moesizlak said: v) sin^2x=1-cosx vi)sin^2x=1 vii)1-cos^2x=2sin x viii) sin^2 x=2cos^2 x ix) 2sin^2 x=3cos x x) 3tan^2x-10tan x +3=0 thanks in advance really stuck ! Click to expand... Please don't post more than two questions in a thread. Otherwise the thread can get convoluted and difficult to follow. See rule #8: http://www.mathhelpforum.com/math-help/f12/list-rules-used-moderate-mhf-please-read-carefully-before-posting-151418.html. Thread closed.