g(x)=cos(sinx),(0

Let t = SiNx 0

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1. 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
2. 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
3. The known function f (x) = (1-sin2x) / cosx Let α be the angle of the fourth quadrant and Tan α = - 4 / 3
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6. 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
7. If cos ^ 2 x = - cosx under the root sign, then the value range of X
8. For the image with root cos x, all the points on the image with root cos (2x + π / 4) are needed
9. 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
10. 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?
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16. What is the original function of the square of cosx?
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20. The minimum value of the function y = sin ^ 2-cos ^ 2x is