Mathematics · Limits, Continuity and DifferentiabilityJEE Main 2026 — 24 January, Morning Shift — Question 1If the function f(x)=ex(etanx−x−1)+loge(secx+tanx)−xtanx−x\mathrm{f}(\mathrm{x}) =\frac{\mathrm{e}^{\mathrm{x}}\left(\mathrm{e}^{\tan \mathrm{x}-\mathrm{x}}-1\right)+\log _{\mathrm{e}}(\sec \mathrm{x}+\tan \mathrm{x})-\mathrm{x}}{\tan \mathrm{x}-\mathrm{x}}f(x)=tanx−xex(etanx−x−1)+loge(secx+tanx)−x is Continuous at x=0\mathrm{x}=0x=0, then the value of f(0)\mathrm{f}(0)f(0) is equal toAOption A: 222BOption B: 23\frac{2}{3}32COption C: 12\frac{1}{2}21DOption D: 32\frac{3}{2}23CorrectAnswer: DStep-by-step solutionf(0)=Limx→0etanx−ex+ln(secx+tanx)−xtanx−x\mathrm{f}(0)=\underset{\mathrm{x} \rightarrow 0}{\operatorname{Lim}} \frac{\mathrm{e}^{\tan \mathrm{x}}-\mathrm{e}^{\mathrm{x}}+\ln (\sec \mathrm{x}+\tan \mathrm{x})-\mathrm{x}}{\tan \mathrm{x}-\mathrm{x}}f(0)=x→0Limtanx−xetanx−ex+ln(secx+tanx)−x Applying L'hospital rule ⇒f(0)=Limx→0etanx⋅sec2x−ex+secx−1sec2x−1\Rightarrow \mathrm{f}(0)=\operatorname{Lim}_{\mathrm{x} \rightarrow 0} \frac{\mathrm{e}^{\tan \mathrm{x}} \cdot \sec ^{2} \mathrm{x}-\mathrm{e}^{\mathrm{x}}+\sec \mathrm{x}-1}{\sec ^{2} \mathrm{x}-1}⇒f(0)=Limx→0sec2x−1etanx⋅sec2x−ex+secx−1 ⇒f(0)=Limx→0etanx(sec2x−1)+(etanx−ex)+secx−1tan2x\Rightarrow \mathrm{f}(0)=\operatorname{Lim}_{\mathrm{x} \rightarrow 0} \frac{\mathrm{e}^{\tan \mathrm{x}}\left(\sec ^{2} \mathrm{x}-1\right)+\left(\mathrm{e}^{\tan \mathrm{x}}-\mathrm{e}^{\mathrm{x}}\right)+\sec \mathrm{x}-1}{\tan ^{2} \mathrm{x}}⇒f(0)=Limx→0tan2xetanx(sec2x−1)+(etanx−ex)+secx−1 ⇒f(0)=Limx→0(etanx+ex(etanx−x−1)tan2x+1secx+1)\Rightarrow f(0)=\operatorname{Lim}_{x \rightarrow 0}\left(e^{\tan x}+\frac{e^{x}\left(e^{\tan x-x}-1\right)}{\tan ^{2} x}+\frac{1}{\sec x+1}\right)⇒f(0)=Limx→0(etanx+tan2xex(etanx−x−1)+secx+11) ⇒f(0)=1+0+12=32\Rightarrow \mathrm{f}(0)=1+0+\frac{1}{2}=\frac{3}{2}⇒f(0)=1+0+21=23Answer key and solution verified before publishing.Practise Limits, Continuity and DifferentiabilityStart with this question, then two more from the same chapter — with a tutor that explains every step. Free.Solve a similar one free→ExamJEE Main 2026Paper24 January, Morning ShiftSubjectMathematicsChapterLimits, Continuity and DifferentiabilityTopicContinuityQuestion 2 →Let a circle of radius 4 pass through the origin O , the points A(-√(3) a, 0) and B(0,-√(2) b) , where a and b are real parameters and ab…More Limits, Continuity and Differentiability questions from this paperLet alpha, beta in mathbbR be such that the function f( x)= begincases2 alpha ( x^2-2 )+2 beta x & , x<1 \\(alpha+3) x+(alpha-beta) & , x…