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The value of a and b such that the funct...

The value of a and b such that the function
f(x) ` {:{(-2 sin x", "-pile x le -pi/2 ),(a sin x+b " ," -pi/2 lt x lt pi/2 ),(cos x", " pi/2 le x le pi ):}` is continuous in ` [ - pi , pi ] ` are

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