If f(x) is continuous over [-pi, pi], wh...

If f(x) is continuous over `[-pi, pi]`, where f(x) is defined as
`f(x) = {(-2sin x, ",",-pi le x le (-pi)/2),(alpha sin x + beta, ",", -(pi)/2 lt x lt (pi)/2 ),(cos x, ",", (pi)/2 le x lt pi ):}`
then `alpha` and `beta` equals

A

a) `alpha = 2`, `beta = 1`

B

b) `alpha = beta = 1`

C

c) `alpha = -1`, beta=1`

D

d)`alpha=beta=2`

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