∫ 1/(a^2 + x^2) dx = ?
A
(1/a) tan^-1(x/a) + C
B
ln|x| + C
C
sin^-1(x/a) + C
D
cos^-1(x/a) + C
Analysis & Theory
∫ 1/(a^2 + x^2) dx = (1/a) tan^-1(x/a) + C.
∫ 1/√(a^2 - x^2) dx = ?
A
(1/a) tan^-1(x/a) + C
B
sin^-1(x/a) + C
C
cos^-1(x/a) + C
D
ln|x| + C
Analysis & Theory
∫ 1/√(a^2 - x^2) dx = sin^-1(x/a) + C.
∫ 1/√(x^2 + a^2) dx = ?
A
ln|x + √(x^2 + a^2)| + C
B
tan^-1(x/a) + C
C
sin^-1(x/a) + C
D
√(x^2 + a^2) + C
Analysis & Theory
∫ 1/√(x^2 + a^2) dx = ln|x + √(x^2 + a^2)| + C.
∫ dx/√(x^2 - a^2) = ?
A
ln|x + √(x^2 - a^2)| + C
B
tan^-1(x/a) + C
C
cos^-1(x/a) + C
D
sin^-1(x/a) + C
Analysis & Theory
∫ dx/√(x^2 - a^2) = ln|x + √(x^2 - a^2)| + C.
∫ dx/(x^2 - a^2) = ?
A
(1/2a) ln|(x-a)/(x+a)| + C
B
(1/a) tan^-1(x/a) + C
C
ln|x| + C
D
cos^-1(x/a) + C
Analysis & Theory
∫ dx/(x^2 - a^2) = (1/2a) ln|(x-a)/(x+a)| + C.
∫ dx/(a^2 - x^2) = ?
A
(1/2a) ln|(a+x)/(a-x)| + C
B
(1/a) tan^-1(x/a) + C
C
ln|x| + C
D
sin^-1(x/a) + C
Analysis & Theory
∫ dx/(a^2 - x^2) = (1/2a) ln|(a+x)/(a-x)| + C.
∫ dx/(√(a^2 - x^2)) = ?
A
sin^-1(x/a) + C
B
tan^-1(x/a) + C
C
ln|x| + C
D
cos^-1(x/a) + C
Analysis & Theory
This is a direct standard result: ∫ dx/√(a^2 - x^2) = sin^-1(x/a) + C.
∫ dx/(x√(x^2 - a^2)) = ?
A
(1/a) sec^-1(|x|/a) + C
B
tan^-1(x/a) + C
C
ln|x| + C
D
cos^-1(x/a) + C
Analysis & Theory
∫ dx/(x√(x^2 - a^2)) = (1/a) sec^-1(|x|/a) + C.
∫ dx/(x^2 + a^2)^2 = ?
A
x/(2a^2(x^2 + a^2)) + 1/(2a^3) tan^-1(x/a) + C
B
1/(a^2) tan^-1(x/a) + C
C
ln|x| + C
D
1/(x^2 + a^2) + C
Analysis & Theory
Standard formula: ∫ dx/(x^2 + a^2)^2 = x/(2a^2(x^2 + a^2)) + 1/(2a^3) tan^-1(x/a) + C.
Which of the following integrals results in a logarithmic form?
A
∫ dx/x
B
∫ dx/(a^2 + x^2)
C
∫ dx/√(a^2 - x^2)
D
∫ dx/(x^2 + a^2)
Analysis & Theory
∫ dx/x = ln|x| + C is the standard logarithmic integral.