Level:
Project ID:
9000046506
Source Problem:
Accepted:
1
Clonable:
1
Easy:
1
Identify the optimal first step convenient to solve the following trigonometric
equation. Do not consider the step which is possible but does not help to solve the
equation.
\[
\sin 2x =\mathop{\mathrm{tg}}\nolimits x
\]
\(2\sin x\cdot \cos x = \frac{\sin x}
{\cos x}\)
substitution \( 2x = z\)
\(\sin x = \frac{\mathop{\mathrm{tg}}\nolimits x}
{2} \)
\(\cos ^{2}x -\sin ^{2}x =\mathop{\mathrm{tg}}\nolimits x\)