find the range of 3cos2x
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Answer:
the value of cosθ always lies between -1 and 1
so, θ = 2x
-1 ≤ cos2x ≤ 1
multiplying by 3
-3 ≤ 3cos2x ≤ 3
-3 ≤ y ≤ 3
range = [ -3,3 ]
Step-by-step explanation:
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