The amplitude is ' 1 ' .
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The amplitude is 4 .
amplitude =7. to find the period, set 2x equal to 2∏. then x=∏=period
cos x - 0.5 = 0 ⇒ cos x = 0.5 ⇒ x = 2nπ ± π/3
No, but cos(-x) = cos(x), because the cosine function is an even function.
cos x equals cos -x because cos is an even function. An even function f is such that f(x) = f(-x).