Let f (x) = xsinx (x ∈ R). If x ∈ (- π / 2,3 π / 2) and f (x) ≥ (- 1 / 2) x, the value range of X is obtained

When x is greater than or equal to 0, it can be simplified as SiNx ≥ - 1 / 2
x∈(π,7π/6）,
When x

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1. A student studies the function f (x) = xsinx and draws the following four conclusions: 1) the function f (x) increases monotonically on [− π 2, π 2]; 2) there is a constant M > 0, so that | f (x) | ≤ m | x | holds for all real numbers x; 3) the function f (x) has no minimum value at (0, π), but must have a maximum value; 4) the point (π, 0) is a symmetry center of the function y = f (x) image （　　） A. ③B. ②③C. ②④D. ①②④
2. Higher number, y = the derivative of e ^ x (cosx + xsinx),
3. Find the monotone interval of function f (x) = 2 / × + SiNx Is there any wood to be broken?
4. What is the derivative of the function f (x) = SiNx / x? The answer is xcosx SiNx / x ^ 2
5. Find the derivative of the function y = 1 / X Find the derivative function of the following function y=1/x
6. The derivative of the function y = () is equal to itself
7. What is the derivative of 1 / [(X-2) ^ 2 * (3x + 1) ^ 2]? What about the derivative of 1 / (X-2) ^ 2?
8. The root x power of Y is equal to the root y power of X
9. Finding the n-order derivative y ^ (n) of y = x / radical (2-x) How to calculate and the answer is not the same!
10. What is the property of monotonicity of derivative function?
11. If f (SiNx) = 3-cos2x, then f (cos15 degrees)=
12. Let (SiNx) = 2-cos2x, then f (COS π / 6) =?
13. Given SiNx = 2 / 3, find the value of (cosx SiNx / cosx + sin) + (cosx + sin / cosx SiNx)
14. The derivative of y = e ^ TaNx TaNx is to the power of E and 2 is to the power of TaNx
15. Derivative of implicit function of equation y = sin (x + y)
16. The derivative velocity of X + 1 / ex!
17. Y = x ^ ex, find the derivative of Y
18. Why is f (x) = (x-k) ex derivative image tilted less than 90 degrees
19. How to find the derivative of y = (x + 1) (x + 2) (x + 3)
20. What is the derivative of y = x + m