Tìm giá trị lớn nhất, nhỏ nhất: y= cos2x – 2sinx – 1 Giúp mình giải với ạ!! 30/09/2021 Bởi Camila Tìm giá trị lớn nhất, nhỏ nhất: y= cos2x – 2sinx – 1 Giúp mình giải với ạ!!
Đáp án: Simplifying cos2x + -2sinx + -1 = 0 Reorder the terms: -1 + cos2x + -2insx = 0 Solving -1 + cos2x + -2insx = 0 Solving for variable ‘c’. Move all terms containing c to the left, all other terms to the right. Add ‘1’ to each side of the equation. -1 + cos2x + 1 + -2insx = 0 + 1 Reorder the terms: -1 + 1 + cos2x + -2insx = 0 + 1 Combine like terms: -1 + 1 = 0 0 + cos2x + -2insx = 0 + 1 cos2x + -2insx = 0 + 1 Combine like terms: 0 + 1 = 1 cos2x + -2insx = 1 Add ‘2insx’ to each side of the equation. cos2x + -2insx + 2insx = 1 + 2insx Combine like terms: -2insx + 2insx = 0 cos2x + 0 = 1 + 2insx cos2x = 1 + 2insx Divide each side by ‘os2x’. c = o-1s-2x-1 + 2ino-1s-1 Simplifying c = o-1s-2x-1 + 2ino-1s-1 Reorder the terms: c = 2ino-1s-1 + o-1s-2x-1 Giải thích các bước giải: Bình luận
Đáp án: Simplifying
cos2x + -2sinx + -1 = 0
Reorder the terms:
-1 + cos2x + -2insx = 0
Solving
-1 + cos2x + -2insx = 0
Solving for variable ‘c’.
Move all terms containing c to the left, all other terms to the right.
Add ‘1’ to each side of the equation.
-1 + cos2x + 1 + -2insx = 0 + 1
Reorder the terms:
-1 + 1 + cos2x + -2insx = 0 + 1
Combine like terms: -1 + 1 = 0
0 + cos2x + -2insx = 0 + 1
cos2x + -2insx = 0 + 1
Combine like terms: 0 + 1 = 1
cos2x + -2insx = 1
Add ‘2insx’ to each side of the equation.
cos2x + -2insx + 2insx = 1 + 2insx
Combine like terms: -2insx + 2insx = 0
cos2x + 0 = 1 + 2insx
cos2x = 1 + 2insx
Divide each side by ‘os2x’.
c = o-1s-2x-1 + 2ino-1s-1
Simplifying
c = o-1s-2x-1 + 2ino-1s-1
Reorder the terms:
c = 2ino-1s-1 + o-1s-2x-1
Giải thích các bước giải: