cos = adjacent of angle a / hypotenuse
cos = adjacent of angle a / hypotenuse . . . . . . . .
let's say the height of the triangle is 4 cm., the base is 3 cm, and the hypotenuse is 5 cm. if the top angle was angle a then the value would be 4/5. because the height is adjacent to angle a and the hypotenuse is 5 cm.
for x=39 the graph reaches its lowest point.
the minimum value of y is:
i think the answer is b)
first option. f(x) has no zeroes
second option. f(x) has a period of 2π.
1) the function sec(x) is the inverse of the cosine function:
this function has no zeroes, because:
it can not be equal to zero
then the first option is true.
2) as the secant function is the inverse of the cosine function, it has the same period 2π, then the second option is true.
3) the cosine function has an amplitude of 1, but the secant function does not, then the third option is false.
4) the secant function is symmetric about the y-axis, but not about the origin, then the fourth option is false.
5) the asymptotes of the secant funtion are where the cosine function is equal to zero, this is at integer multiples of π/2, then 5the fifth option is false.