Question

For \[\int\frac{\sin x}{\sin(x+a)}\,dx\], which substitution gives \[dx=dt\]?

Options

• \[\sin(x+a)=t\]

• \[x+a=t\]

• \[\cos(x+a)=t\]

• \[x-a=t\]

Answer 1

Put \[x+a=t\], so \[x=t-a\]. Differentiating gives \[dx=dt\].