If cos ^ 2 x = - cosx under the root sign, then the value range of X

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• 1. For the image with root cos x, all the points on the image with root cos (2x + π / 4) are needed
• 2. Given the vector a = (cos3 / 2x, SIN3 / 2x), B = (cosx / 2, - SiNx / 2), and X belongs to [π / 2, π],. | a + B | is greater than the root sign 3, find the value range of X
• 3. If sin ^ 2x is greater than cos ^ 2x, then the value range of X is Make the unit circle and the straight line y = x.y = - x on the rectangular axis, and then do it according to the definition of triangle?
• 4. If a point on the terminal edge of angle α is (2x-3,4-x), and sin α cos α
• 5. 2Sin ^ 2x + cos ^ 2Y = 1, find the value range of sin ^ 2x + cos ^ 2Y
• 6. Find the value of F (x) = cos ^ 2-2sinxcosx-sin ^ 2x X which belongs to [0, π / 2] Answer in an hour
• 7. The period of y = cos absolute value x and y = cos absolute value x
• 8. The minimum positive period of the function y = cosx · cos (x - π / 3) is? Process urgent!
• 9. The minimum positive period of the function y = radical (COS ^ 4 x / 2 - cosx) is__________
• 10. Y = the minimum positive period of the radical (COS ^ 4 (x / 2) - cosx)
• 11. If sin square x-cos square x is larger than cosx SiNx, and X belongs to (0,2), then the value range of angle X is
• 12. The maximum of function y = cosx / 2 + sin (60-x / 2)
• 13. Find the maximum value of the function y = 2-sin ^ 2x + cosx and the corresponding value of X
• 14. The known function f (x) = (1-sin2x) / cosx Let α be the angle of the fourth quadrant and Tan α = - 4 / 3
• 15. Given the function f (x) = cosx minus cos (x + π in half), X belongs to R (1). Find the maximum value of F (x) (2) if f (a) = three quarters, find the value of sin2a
• 16. Given the function f (x) = cosx cos (x + pi / 2), X belongs to R. (1) find the maximum of F (x); (2) if f (a) = 3 / 4, find the value of sin2a
• 17. g(x)=cos(sinx),(0
• 18. How to find the minimum value (0) of (2-sinx) / cosx
• 19. If x belongs to (0, Pai / 2), what is the maximum and minimum value of F (x) = (SiNx + 2) (cosx + 2)
• 20. What is the original function of the square of (cosx + SiNx)