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Q.

Derivative of f(tanx) with respect to g(secx) at x=π/4 where f1(1)=2 and g1(2)=4 is 

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a

12

b

32

c

2

d

-12

answer is A.

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Detailed Solution

d(f(tanx))d(g(secx))=f1(tanx)sec2xg1(secx)secxtanx  At x=π/4,d(f(tanx))d(g(secx))=2×242=1/2

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