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Question

Column IColumn 2Column 3(I)f(x)=tan(2tan11+x11+x+1)(i)f(x)dx=43x34+C(P)10f(x)dx=43(II)f(x)=cot(2tan11+x4x1+x+4x)(ii)f(x)dx=45x54+C(Q)10f(x)dx=45(III)f(x)1tan(12sin1(1x1+x))1+tan(12sin1(1x1+x))(iii)f(x)dx=23x34+C(R)10f(x)dx=23(IV)f(x)=xtan(2tan1(1+x+11+x11+x+1+1+x1))(iv)f(x)dx=25x54+C(S)10f(x)dx=25

Which of the following options is only correct combination?


A

(II), (i), (P)

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B

(II), (iv), (S)

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C

(III), (i), (P)

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D

(IV), (ii), (Q)

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Solution

The correct option is D

(IV), (ii), (Q)


Let x=tan2θ
x=tan4θtanθ=x14dx=4tan3θsec2θdθ1+x=secθ

(A)tan(2tan11+x11+x+1)dx=tanθ.4tan3θsec2θdθ=45tan5θ+C=45(x54)+C

(B)cot(2tan11+x4x1+x+4x)dx=cot(2tan1)(secθtanθ)24tan3θsec2θdθ=cot(2tan1(1sinθcosθ))4tan3θsec2θdθtanθ4tan3θsec2θdθ=45tan5θ+C=45x54+C

(C)1tan(12sin1(1x1+x))1+tanx(12sin1(1x1+x))dx=1tan(π4θ)1+tan(π4θ)4tan3θsec2θdθ=tanθ4tan3θsec2θdθ=45tan5θ+C=45x54+C

(D)xtan(2tan1(1+x+11+x11+x+1+1+x1))dx=inttan2θtan(2tan1(cosθ2sinθ2cosθ2+sinθ2))4tan3θsec2θdθ=tan2θtan(π2θ)4tan3θsec2θdθ=45tan5θ+C=45x54+C


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