ECAT Mathematics
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ECAT Mathematics

Chapter 16: Differentiation

75 Questions 90 Minutes Pass: 60%+ ECAT Prep
0 The derivative f'(x) = lim_{h→0} [f(x+h)−f(x)]/h is:
1 d/dx(x^n) =
2 d/dx(c) where c is constant =
3 d/dx(sinx) =
4 d/dx(cosx) =
5 d/dx(tanx) =
6 d/dx(e^x) =
7 d/dx(lnx) =
8 Product rule: d/dx[f(x)g(x)] =
9 Quotient rule: d/dx[f/g] =
10 Chain rule: d/dx[f(g(x))] =
11 d/dx(x³+2x²−5x+1) =
12 d/dx(sin(x²)) using chain rule =
13 d/dx(e^{x²}) =
14 d/dx(ln(x²)) =
15 The second derivative f''(x) =
16 d/dx(x³) =
17 d/dx(√x) =
18 d/dx(1/x) =
19 d/dx(sec x) =
20 d/dx(cscx) =
21 d/dx(cotx) =
22 d/dx(a^x) =
23 d/dx(log_a x) =
24 d/dx(sin⁻¹x) =
25 d/dx(cos⁻¹x) =
26 d/dx(tan⁻¹x) =
27 If f(x)=x² sinx: f'(x) =
28 If f(x)=sinx/x: f'(x) =
29 Implicit differentiation of x²+y²=r²: dy/dx =
30 Tangent to curve y=x² at x=2: slope =
31 If y=x³−3x, stationary points where y'=0: 3x²−3=0→x=
32 At x=1: y''=6x=6>0: the point is a:
33 At x=−1: y''=6(−1)=−6<0: the point is a:
34 The chain rule applied to y=f(u) where u=g(x): dy/dx =
35 d/dx(e^{sinx}) =
36 d/dx(ln(cosx)) =
37 d²y/dx² for y=x⁴: first y'=4x³, then y''=
38 If y=x^n, the nth derivative is:
39 Critical points occur where:
40 Point of inflection occurs where:
41 Rolle's Theorem: if f is continuous on [a,b], differentiable on (a,b), and f(a)=f(b), then ∃c∈(a,b) with:
42 Mean Value Theorem: f'(c) =
43 d/dx(x sin x + cos x) =
44 For y = e^{ax}: dy/dx =
45 Parametric: x=t², y=t³. dy/dx =
46 If f(x)=x²+3x, the instantaneous rate of change at x=2:
47 d/dx(x e^x) =
48 d/dx[ln(x²+1)] =
49 The slope of normal to y=x² at x=3 is:
50 Higher-order derivative: if f(x)=sinx, f'''(x) =
51 d/dx(tan(3x²)) =
52 Increasing function: f'(x) ? 0
53 Decreasing function: f'(x) ? 0
54 Second derivative test for maxima: f'(c)=0 and f''(c):
55 Second derivative test for minima: f'(c)=0 and f''(c):
56 d/dx(x⁴−4x³+6x²−4x+1) = (x−1)^4 diff:
57 The velocity v = dx/dt. Acceleration =
58 If position s=5t²−3t+2, velocity at t=2:
59 d/dx(√(1+x²)) =
60 d/dx(x/sinx) using quotient rule:
61 The gradient of a curve at a point is the:
62 For minimum material box optimization (calculus): the condition is:
63 d/dx(x^x) = ? (using logarithmic differentiation)
64 d/dx(logₑ(sinx)) =
65 d/dx(cos²x) =
66 The derivative of f(x)=|x| at x=0:
67 L'Hopital applied to lim_{x→0} x/sinx: d/dx(x)=1, d/dx(sinx)=cosx. Limit=
68 d/dx(sin²x+cos²x) =
69 For implicit differentiation of xy=1: y+x(dy/dx)=0→dy/dx=
70 For y=1/x: dy/dx=−y/x=−(1/x)/x=−1/x². Verify:
71 d/dx[f(x)]^n =
72 d/dx(sin(cosx)) =
73 If y = ln(tanx), dy/dx =
74 d/dx[f(2x+3)] = f'(2x+3) × ?
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