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Question

f(x)=⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪1sin3x3cos2x,ifx<x2p,ifx=π2q(1sinx)(π2x)2,ifx>π2 is continuous at x=π2.

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Solution

Applying L's Hospital on RHL,we get
RHL=qcosx2(π2x)(2)
Again L's Hospital, we get
RHL=qsinx8
Putting x=π2
RHL=q8
Again L's Hospital on LHL, we get -
LHL=3sin2xcosx6cosxsinx
LHL=sinx2
Putting x=π2, we get
LHL=12
Hence, p=12,q=4

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