Câu1: Cho cos2x=3/5 với 3pi/4. Tính sinx, cosx, tan(x-pi/4). Câu2: Tìm giá trị lớn nhất, nhỏ nhất của biểu thức P= -2sin(x+pi/3)+2

Classify the polygon by its number of sides. state whether the polygon appears to be regular or not regular. a.heptagon, regular b. heptagon, not regular c. octagon, regular d. octagon, not regular

Which pair of angles are vertical angles? ∠1 and ∠4 ∠1 and ∠2 ∠2 and ∠4 ∠2 and ∠3

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?