(a) Find an angle between 0 and 2π that is coterminal with −19π10.

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Step-by-step explanation:

All coterminal angles of an angle are defined as

or

where, n is an integer.

The given angle is

So, all coterminal angles of an angle are

For n=1,

Since,    between 0 and 2π, therefore,  the required coterminal angle is .

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