* Conditional Trigonometry IF A + B + C = 180°
prove that :
Sin²A/2 + Sin²B/2 - Sin²C/2 =
1 - 2CosA/2.CosB/2.SinC/2​

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)

Line u passes through points (-52, -18) and (-29, 53). line v passes through points (90, 33) and (19, 56). are line u and line v parallel or perpendicular?

Here is another math questions. i will keep asking different questions. 4^2x=6