Draw the graph of y=2cosx, 0≤ ≤ 2 π.Write the domain & range.
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Given : y = 2cosx
0 ≤ x ≤ 2π
To Find : domain & range.
Draw graph
Solution:
y = 2cosx
0 ≤ x ≤ 2π
Domain is [0 , 2π] as x ∈ [0 , 2π]
x y= 2cosx
0 2
π/6 √3
π/4 √2
π/3 1
π/2 0
2π/3 -1
3π/4 -√2
5π/6 - √3
π -2
7π/6 - √3
5π/4 -√2
4π/3 -1
3π/2 0
5π/3 1
7π/4 √2
11π/6 √3
2π 2
Range is [ -2 , 2 ]
Graph is drawn used points
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