I need the picture. Or i can't see the pic
2,500 yea is that what you were looking for
You recieve 57.2 in change. This is because you add 6.95 +5.85 to get 12.8. Then you do 70-12.8 to get 57.2.
Left side:
1-sin²(x) = cos²(x)
1-sin²(x) / cos(x) = cos²(x) / cos(x) = <em>cos(x)</em>
Right side:
sin(2x) = 2 sin(x) cos(x)
sin(2x) / 2 sin(x) = 2 sin(x) cos(x) / 2 sin(x) = <em>cos x </em>