What is the amplitude of the function f(x) = cos( 1/2 X)

Graph the trigonometric function using the amplitude, period, phase shift, and vertical shift.

Amplitude:  1

For this case, the first thing we should do is use the following trigonometric relationship:
 sine (x) = (C.O) / (h)
 Where,
 x: angle
 C.O: opposite leg.
 h: hypotenuse
 Substituting values:
 sine (27) = (34) / (x)
 Clearing x:
 x = (34) / (sine (27))
 x = 74.89
 
 x = 74.89