Is y = secx = cosx / 1 even? Why

Is y = secx = cosx / 1 even? Why

Yes, because cosx / 1 = cos (- X / 1)

Is y = cosx ^ 2 an even function with π as the minimum positive period?
You haven't finished reading the question, have you?

Is your question (cosx) ^ 2 or cos (x ^ 2)
It should be (cosx) ^ 2, right
Angle doubling formula (cosx) ^ 2 = (COS 2x - 1) / 2

20110113 it is known that the minimum value of quadratic function f (x) is 1, and f (0) = f (2) = 3
1. Find the analytic expression of F (x)
2. If f (x) is not monotone in the interval [2a, a + 1], find the value range of real number a
3. In the interval [- 1,1], the image of y = f (x) is always above the image of y = 2x + 2m + 1. Try to determine the value range of real number M

1. ∵ he is a quadratic function with the minimum value of 1, and f (0) = f (2) = 3 ∵ f (x) = 2x & sup2; - 4x + 32, ∵ f (x) is not monotone in the interval [2a, a + 1], and ∵ f (x) symmetry axis is x = 1 ∵ 2A < 1A + 1 > 1 ∵ 0 < a < 1 / 23,