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Question -

Find the domain of definition of f(x) = cos┬а-1┬а(x2┬атАУ4)



Answer -

Given f(x) = cos┬а-1┬а(x2┬атАУ4)

We know that domain ofcos-1┬а(x2┬атАУ 4) lies in the interval [-1, 1]

Therefore, we canwrite as

-1 тЙд x2┬атАУ4 тЙд 1

4 тАУ 1 тЙд x2┬атЙд1 + 4

3 тЙд x2┬атЙд5

┬▒тИЪ┬а3 тЙд x тЙд ┬▒тИЪ5

тАУ тИЪ5 тЙд x тЙд тАУ тИЪ3 and тИЪ3тЙд x тЙд тИЪ5

Therefore domain ofcos-1┬а(x2┬атАУ 4) is [- тИЪ5, тАУ тИЪ3] тИк [тИЪ3, тИЪ5]

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