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f(x)= {(-4 sin x + cos x",",x le - (pi)/...

`f(x)= {(-4 sin x + cos x",",x le - (pi)/(2)),(a sin x + b",",-(pi)/(2) lt x lt (pi)/(2)),(cos x + 2",",(pi)/(2) le x):}`. If f(x) is continuous for `x in R`, then find the value of a and b.

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The correct Answer is:
`a= -1, b= 3`
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