Complementary angles are angles whose sum is 90 degrees.
90 - 67 = 23
23 degrees is the measure of its complementary angle.
im just answering for free points
Step-by-step explanation:
Period is from 0 to 2pi
take the deritivive then take it again
we get f''(x)=-4cos²(x)-2cos(x)+2
it is negative between 0 and pi/3 and also between 5pi/3 and 2pi
concave down in the interval
![[0, \frac{ \pi }{3}]](https://tex.z-dn.net/?f=%5B0%2C%20%5Cfrac%7B%20%5Cpi%20%7D%7B3%7D%5D)
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