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The minimum value of sine function is 1 and its maximum value is 1.
So, the minimum value of sinx is -1 and its maximum value is 1.
-1 ≤ sinx ≤ 1
or
sinx ∈ [-1, 1]
When x approaches positive infinity, the value of sinx will oscillate from -1 to 1.
15. Answer :
The minimum value of cosine function is 1 and its maximum value is 1.
So, the minimum value of cos(2x) is -1 and its maximum value is 1.
-1 ≤ cos(2x) ≤ 1
or
cos(2x) ∈ [-1, 1]
When x approaches positive infinity, the value of cos(2x) will oscillate from -1 to 1.
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