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Q.

If ∫1+sec⁡xdx=Ksin−1⁡(f(x))+C then

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a

f(x)=2sin⁡(x/2),k=2

b

f(x)=2cos⁡(x/2),K=2

c

f(x)=2tan⁡(x/2),K=2

d

f(x)=2sin⁡(x/2),K=2

answer is A.

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Detailed Solution

1+sec⁡x=1+cos⁡xcos⁡x=2cos⁡x/21−2sin2⁡x/2 soputting sin⁡x/2=t we have∫1+sec⁡xdx=∫2cos⁡x/21−2sin2⁡x/2dx=2sin−1⁡2t+C(t=sin⁡x/2)=2sin−1⁡(2sin⁡x/2)+Cso  f(x)=2sin⁡x/2 and K=2
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If ∫1+sec⁡xdx=Ksin−1⁡(f(x))+C then