Question

$\log x + \log(\log x)$

• A. $\int_{}^{}{\frac{1 + \log x}{x}\ }dx$
• B. $\log x = t$
• C. $1 + \log x = t$
• D. None of these

Answer 1

Answer: (C)

$1 + \log x = t$

Answer 2

Put $\int_{}^{}{2x\cos^{3}x^{2}\sin x^{2}dx =}$

$\int \frac { ( 1 + \log x ) ^ { 2 } } { x } d x = \int t ^ { 2 } d t$ $\frac{1}{4}\cos^{4}x^{2} + c$