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Q.

dxsin(xπ3)cosx=

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a

2[loge|sin(xπ).secx|]+c

b

2[loge|sin(xπ2).secx|]+c

c

2[loge|cos(xπ3).secx|]+c

d

2[loge|sin(xπ3).secx|]+c

answer is D.

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Detailed Solution

dxsin(xπ3)cosx

=212sin(xπ3)cosxdx

=2cos[x(xπ3)]sin(xπ3)cosxdx

=2cosxcos(xπ3)+sinxsin(xπ3)sin(xπ3)cosx.dx

=2[cot(xπ3)+tanx]dx

=2[loge|sin(xπ3)|+loge|secx|]+c

=2[loge|sin(xπ3).secx|]+c .

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