|Jan24-05, 07:52 PM||#1|
How to prove this identity?
how would u proove this identity
[tex] \cos^2 \theta= \cos^2 - \sin^2= 2\cos^2\theta-1=1-2\sin^2\theta [/tex] ? The example i was given was [tex] \sin2\theta=2\sin\theta \cos\theta [/tex] this was a little bit easier to understand since there was a left and right side, im not sure how to proove this. How was this formula derived from the sum differnce formula?
|Jan24-05, 07:57 PM||#2|
cos(a+b) = cos(a)cos(b)-sin(a)sin(b)
this is the first step... the rest should be easy
|Similar Threads for: How to prove this identity?|
|Please help me prove this identity||Advanced Physics Homework||0|
|Trigonometry, Prove the Identity and more||Precalculus Mathematics Homework||48|
|How to Prove contracted Bianchi Identity||Differential Geometry||5|
|could someone please prove this identity||Precalculus Mathematics Homework||2|
|Prove Trig Identity||General Math||6|