Write an equation for a line

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What is the equation for a straight line that passes through the origin and is inclined $\frac{\pi}{3}$ radians from the x-axis? The line passes through the first quadrant.

Is the gradient $\frac{\pi}{3}$?

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Hint:

  • It passes through origin, what can you say about $b$?
  • The gradient should involve $\tan$.