Question

Prove that this equation is an identity: {cosine(alpha)-sine(alpha)}^2=1-2 sine(alpha)cosine(alpha)

Answer 1

\[(cosx - sina)^2 = cos^2x + sin^2x - 2*sinx*cosx\]

Answer 2

you DIDN'T ANSWER THE QUESTION!!!!!

Answer 3

I did !!!

Answer 4

no.... you just restated it and added more....

Answer 5

\[sin^2x + cos^2x = 1 \]

Answer 6

\[\text{^ ^ Now try to do on your own}\]

Answer 7

i did...
i kinda got it not really

Answer 8

\[(\cos(x)-\sin(x))^2=\cos^2(x)+\sin^2(x)-2\cos(x)\sin(x)=1-2\cos(x)\sin(x)\]
but ishaan already stated this