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a
3xsec2x−6sec2x−3+3tanx
b
3xsec2x−5sec2x−3−3tanx
c
3xsec2x+5sec2x+3+3tanx
d
None of the above
answer is C.
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Detailed Solution
Let, (3x+5)(1+tanx)On differentiating w.r.t. r, we getdydx=(3x+5)ddx(1+tanx)+(1+tanx)ddx(3x+5)=(3x+5)0+sec2x+(1+tanx)(3)=3xsec2x+5sec2x+3+3tanx