If A+B+C=180°,then prove that;sin2A-sin2B+sin2C=4cosA. sinB. cosC
(related to trigonometry)

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2

Percent increase and decrease. original number: 45 new number: 18

With this question, the answer with the red arrow is incorrect!