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Q.

The integral 0π/213+2sin x+cos xdx is equal to :

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a

tan1(2)

b

tan1(2)π4

c

12tan1(2)π8

d

12

answer is B.

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Detailed Solution

Let I=0π/213+2sin x+cos xdx
=0π/21+tan2x231+tan2x2+22tanx2+1tan2x2dx
=0π/2sec2 x2dx2tan2 x2+4tan x2+4
Put tan x2=t12sec2 x2dx=dt
x=0t=0,x=π2t=1I=012dt2t2+4t+4=01dtt2+2t+2=01dt(t+1)2+1=tan1(t+1)01=tan12tan11=tan12π4

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