Let P(x, y) be the terminal point on the unit circle determined by t. Then si

P(x, y) is the endpoint of the unit circle determined by t. Then .

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joshyoung05M

According to the definition, $\mathrm{sin}t$ is equivalent to y. $\mathrm{cos}t$ is equivalent to x. $\mathrm{tan}t$ is equivalent to $\frac{y}{x}$
The unidentified terms are $x,y,\frac{y}{x}$.