Given SiNx = 2 / 3, find the value of (cosx SiNx / cosx + sin) + (cosx + sin / cosx SiNx)

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• 1. Let (SiNx) = 2-cos2x, then f (COS π / 6) =?
• 2. If f (SiNx) = 3-cos2x, then f (cos15 degrees)=
• 3. 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
• 4. 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
• 5. Higher number, y = the derivative of e ^ x (cosx + xsinx),
• 6. Find the monotone interval of function f (x) = 2 / × + SiNx Is there any wood to be broken?
• 7. What is the derivative of the function f (x) = SiNx / x? The answer is xcosx SiNx / x ^ 2
• 8. Find the derivative of the function y = 1 / X Find the derivative function of the following function y=1/x
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• 11. The derivative of y = e ^ TaNx TaNx is to the power of E and 2 is to the power of TaNx
• 12. Derivative of implicit function of equation y = sin (x + y)
• 13. The derivative velocity of X + 1 / ex!
• 14. Y = x ^ ex, find the derivative of Y
• 15. Why is f (x) = (x-k) ex derivative image tilted less than 90 degrees
• 16. How to find the derivative of y = (x + 1) (x + 2) (x + 3)
• 17. What is the derivative of y = x + m
• 18. The derivative of the function y = 12 (ex + e − x) is () A. 12(ex−e−x)B. 12(ex+e−x)C. ex-e-xD. ex+e-x
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• 20. What is the derivative of F (x) = a (X & # 178; - x-1) / e ^ x?