If A+B+C=180 prove that cos^2a + cos^2B + cos^2C = 1 - 2COSACOSBCOSC
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The answer to the box is 2
..the deal with the reflection is that you reflect the image according to the mirror line given as you can see the image has been reflected to x x =3and x =7
..the deal with the reflection is that you reflect the image according to the mirror line given as you can see the image has been reflected to x x =3and x =7