Question

<br />$x = a \cos\beta + b \sin \beta \: \: and \\ y = a \sin \beta - b \cos \beta \\ so \:proved \: that \: \\ {x}^{2} + {y}^{2} = {a}^{2} + {b}^{2}$<br />​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

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